{"title":"Lunt THa H-alpha Solar Telescopes","description":"\u003cp\u003eLunt THa H-alpha solar telescopes are dedicated hydrogen-alpha refractors for viewing prominences, filaments and surface detail in the chromosphere. The line runs from the compact LS40THa and LS50THa, sold in Standard, Enhanced and Premium PLUS kits, to the large pressure-tuned LS152THa, LS230THa Double Stack and LS300THa.\u003c\/p\u003e\u003cp\u003eMatching double stack filters and modules, clamshell rings and adapters are also part of the line, so a THa telescope can be upgraded for a narrower bandpass and more contrast.\u003c\/p\u003e","products":[{"product_id":"lunt-internal-double-stack-small-format-ls80mt-ls80thapt-ls100mt","title":"Lunt Internal Double Stack Small Format - LS80MT, LS80THaPT \u0026 LS100MT","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInternal double-stack module with new-generation etalon\u003c\/li\u003e\n\u003cli\u003eCompatible with Lunt LS80MT, LS80THaPT \u0026amp; LS100MT telescopes\u003c\/li\u003e\n\u003cli\u003eDramatically increases chromospheric contrast for fine solar details\u003c\/li\u003e\n\u003cli\u003eUser-installable design requires no factory return\u003c\/li\u003e\n\u003cli\u003eFeatures dual independent Doppler True tuning knobs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eLunt Internal Double Stack Small Format (SFPT) Module\u003c\/h2\u003e\n\u003cp\u003eThe Lunt Internal Double Stack Small Format (SFPT) module adds a second, internal etalon to your LS80MT, LS80THaPT, or LS100MT telescope, unlocking a significant increase in solar surface contrast. This user-installable upgrade transforms textured solar features into sharply defined structures, revealing the complex, multi-strand architecture of filaments and the full magnetic complexity of active regions. Dual independent Doppler True tuning knobs provide precise, independent control over each etalon, allowing you to optimize the view for any feature on the sun's dynamic chromosphere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe SFPT Double-Stack Advantage: Unlocking Chromospheric Detail\u003c\/h3\u003e\n\u003cp\u003eBy adding a second etalon inside the telescope, the SFPT module dramatically narrows the bandpass of the optical system. The improvement in chromospheric contrast is immediate, revealing a level of detail that single-stack systems at this aperture cannot resolve. What previously appeared as simple texture separates into discrete, high-contrast structure.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilaments and Prominences:\u003c\/strong\u003e Dark filaments resolve into complex, multi-strand architectures, while prominences show internal threading and flow patterns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Detail:\u003c\/strong\u003e Plage boundaries sharpen into defined cellular networks, and the intricate magnetic structure of active regions becomes fully visible.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUser-Installable Design for LS80MT, LS80THaPT \u0026amp; LS100MT\u003c\/h3\u003e\n\u003cp\u003eThe SFPT module is engineered for straightforward installation by you, eliminating the need for a costly and time-consuming factory return. This design choice makes the double-stack upgrade a flexible investment that can be made at the time of telescope purchase or at any point in the future. Because the module fits entirely inside the main telescope body, it does not alter the instrument's external dimensions, balance, or its capability for nighttime observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Control: Dual Independent Doppler True Tuning\u003c\/h3\u003e\n\u003cp\u003eThis module includes two separate Doppler True tuning knobs, one for the telescope's primary etalon and one for the new internal etalon. This dual-control system is critical for achieving optimal contrast across the entire solar disk. You can independently adjust each etalon to suppress Doppler-shifted light from different solar features, ensuring you can dial in the highest possible contrast for any target, from limb prominences to surface granulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of adding the Lunt SFPT Double Stack module to my LS80MT or LS100MT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is a \u003cstrong\u003edramatic increase in solar surface contrast\u003c\/strong\u003e. The second etalon narrows the system's light bandpass, which makes faint chromospheric details like filaments, plage, and the complex structure within active regions significantly more visible and sharply defined.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to send my Lunt telescope back to the factory to install the SFPT module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Lunt SFPT module is specifically designed to be \u003cstrong\u003euser-installable\u003c\/strong\u003e. This allows you to upgrade your telescope at your convenience without the downtime and expense of shipping it back to the manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SFPT module affect viewing prominences versus surface detail on the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a single-stack system is excellent for prominences, the narrower bandpass of a double-stack system excels at revealing fine \u003cstrong\u003esurface detail\u003c\/strong\u003e. With the SFPT installed, you will see significantly more structure in filaments, active regions, and plage. The dual tuning knobs allow you to adjust the view to optimize for either prominences or surface features, though the greatest improvement is seen on the surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy are there two tuning knobs on the Lunt SFPT Double Stack module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two knobs provide \u003cstrong\u003eindependent Doppler True tuning\u003c\/strong\u003e for each etalon (the original one in your scope and the new one in the SFPT module). This allows you to precisely shift the bandpass of each filter separately to achieve the highest possible contrast on any solar feature, compensating for Doppler-shifted light from different areas of the sun.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill adding the SFPT module change the balance or nighttime use of my Lunt Universal Telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Because the SFPT is an \u003cstrong\u003einternal module\u003c\/strong\u003e, it does not change the telescope's external dimensions, weight distribution, or balance. Your Lunt Universal Telescope remains fully capable for nighttime deep-sky or planetary observing without needing to remove the module.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt SFPT module to see more detail in a solar filament near an active region?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This is a scenario where the SFPT excels. The enhanced contrast will make the dark, multi-strand structure of the filament stand out sharply against the bright chromosphere, and you'll be able to see the complex magnetic webbing of the surrounding active region with much greater clarity than in a single-stack view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eDSII\/SFPTP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product is an internal module and does not ship with separate accessories.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt_Solar_Systems_DSII_SFPT_Internal_Double_Stack_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967532593437,"sku":"LSS-DSII\/SFPTP","price":2093.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-Double-Stack-Module-LS80MT-LS100MT-1.jpg?v=1769116433"},{"product_id":"lunt-ls50tha-ha-telescope","title":"Lunt LS50THa Ha Telescope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm Dedicated Hydrogen-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003eInternal Pressure Tuner (PT) System\u003c\/li\u003e\n\u003cli\u003eB600 Blocking Filter for Visual Use\u003c\/li\u003e\n\u003cli\u003eRack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIdeal for Introduction to Solar Observing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eLunt LS50THa Ha Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS50THa Hydrogen-Alpha Telescope is a complete system designed for the dedicated solar observer, combining a 50mm objective lens with an internal etalon and a B600 blocking filter. This instrument utilizes Lunt's advanced pressure-tuning technology to give you precise, uniform control over the filter's bandpass, revealing dynamic details like prominences, filaments, and surface granulation across the entire solar disk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e50mm Hydrogen-Alpha Optics: Your First View of a Dynamic Sun\u003c\/h3\u003e\n\u003cp\u003eWith a 50mm front objective, the LS50THa gathers enough light to produce bright, detailed views of the Sun's chromosphere. This aperture is the perfect entry point for serious solar observation, allowing you to clearly resolve arching prominences lifting off the solar limb and dark filaments snaking across the Sun's face. The view is a dramatic step up from smaller, entry-level instruments, providing the resolution needed for basic solar research and daily monitoring of solar activity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLunt Pressure Tuner: Uniform Tuning Across the Solar Disk\u003c\/h3\u003e\n\u003cp\u003eUnlike more common tilt-tuned systems, the LS50THa incorporates Lunt's Pressure Tuner (PT). This system adjusts the air pressure between the etalon elements, changing the refractive index to shift the filter's bandpass. The result is a perfectly even, on-band view across the entire field, free from the gradients or \"sweet spots\" that can compromise tilt-tuned designs. This gives you finer control to highlight specific features, whether you're targeting a faint prominence or enhancing the contrast of surface plage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe B600 Blocking Filter and Rack \u0026amp; Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThis package includes the B600 blocking filter, which contains a 6mm filter ideal for visual observation. It provides a generous field of view that fully illuminates the solar disk when used with most Plössl or wide-field eyepieces. The included rack \u0026amp; pinion focuser provides smooth, reliable focusing to achieve a sharp image without the backlash common in lower-quality focusers, completing the LS50THa as a robust, ready-to-use instrument for exploring our nearest star.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I expect to see with the Lunt LS50THa telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt LS50THa is designed to reveal the Sun's dynamic chromosphere in the hydrogen-alpha wavelength. You can observe key solar features such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProminences:\u003c\/strong\u003e Bright, arching structures of plasma extending from the Sun's limb (edge).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilaments:\u003c\/strong\u003e The same structures as prominences, but seen as dark, thread-like features against the brighter solar disk.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Granulation:\u003c\/strong\u003e The convective cell patterns on the Sun's surface, which look like grains of rice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlage:\u003c\/strong\u003e Bright, active regions often found near sunspots.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the Pressure Tuner on the LS50THa different from a tilt-tuner?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ePressure Tuner (PT)\u003c\/strong\u003e adjusts the filter bandpass by changing the air pressure inside the etalon assembly. This provides a more uniform, even view across the entire field. A tilt-tuner physically tilts the etalon, which can introduce a slight brightness gradient and is generally less precise. The PT system is considered a premium feature that ensures optimal contrast everywhere in the eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt LS50THa to see solar flares and prominences during a solar maximum?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The LS50THa is an excellent instrument for observing the heightened activity of a solar maximum. During this period, you will see more frequent and dramatic prominences, larger and more complex sunspot groups (in white light with a proper filter, not H-alpha), and a greater chance of observing the bright, transient flash of a solar flare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"B600\" blocking filter designation for the LS50THa mean?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"B600\" refers to the blocking filter having a \u003cstrong\u003e6mm clear aperture\u003c\/strong\u003e. This size is optimized for visual observing and ensures the entire solar disk is illuminated without vignetting when used with most eyepieces. While it can be used for some basic imaging with small-chip cameras, a larger blocking filter (like a B1200) is recommended for cameras with larger sensors to avoid darkening at the edges of the frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS50THa portable enough for a \"grab-and-go\" mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the LS50THa is very compact and lightweight, making it a perfect match for small, portable mounts like the Sky-Watcher AZ-GTI or a simple photo tripod with a fluid video head. Its small size makes it an ideal instrument for quick setup in your backyard or for traveling to outreach events and eclipses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I upgrade the Lunt LS50THa for higher-contrast views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, one of the key advantages of the Lunt system is its upgradability. You can add an external double-stacking filter (like the LS50FHa) to the front of the LS50THa. This narrows the filter bandpass, which significantly increases contrast on surface details like filaments and active regions, providing a more three-dimensional appearance to the solar disk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS50THa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt_Solar_Systems_LS50THaPT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"B600 \/ 1.25\" R\u0026P Focuser","offer_id":51068691218717,"sku":"LSS-LS50THa\/B600R\u0026P","price":1533.0,"currency_code":"CAD","in_stock":true},{"title":"B600 \/ Helical Focuser","offer_id":44967532855581,"sku":"LSS-LS50THa\/B600PT","price":1393.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-LS50THa-Solar-Telescope-1__63228.1598295758.1280.1280.jpg?v=1684343551"},{"product_id":"lunt-50mm-double-stack-module-ls50tha","title":"Lunt 50mm Double Stack Module - LS50THa","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDouble-Stack Filter for LS50THa Telescopes\u003c\/li\u003e\n\u003cli\u003eDramatically Increases Chromospheric Contrast\u003c\/li\u003e\n\u003cli\u003eReveals Fine Detail in Filaments and Prominences\u003c\/li\u003e\n\u003cli\u003eCompact, Lightweight Design Preserves Portability\u003c\/li\u003e\n\u003cli\u003eTool-Free, Front-Mount Installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt 50mm Double Stack Module - LS50THa\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt 50mm LS50C Double Stack Module is the factory-designed etalon upgrade for the Lunt LS50THa 50mm solar telescope. This compact, front-mounted filter adds a second, precisely tuned etalon to the optical path, significantly narrowing the system's bandpass. The result is a dramatic increase in chromospheric contrast, transforming surface textures into resolved, high-fidelity structures.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDouble-Stacking the 50mm Lunt: Unlocking High-Contrast Detail\u003c\/h3\u003e\n      \u003cp\u003eBy adding a second etalon, the LS50C module substantially boosts the contrast of solar features against the bright chromosphere. This enhancement is immediately visible, revealing complex details that are subtle or invisible in a single-stack system. The upgrade allows you to resolve the multi-strand architecture and dark cores of filaments, see internal threading within prominences, and clearly separate active plage regions from the surrounding surface.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e The narrower bandpass darkens the solar disk, making bright features like filaments and plage stand out with striking clarity.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eVerified Etalons:\u003c\/strong\u003e Each new-generation etalon is individually tested and verified on precision metrology equipment to ensure it meets Lunt's stringent specifications.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTilt-Tuned Mechanism:\u003c\/strong\u003e A fine-tuning knob allows you to tilt the etalon, shifting the bandpass slightly to optimize the view for different features across the solar disk.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eLS50C Design: A Compact, Tool-Free Upgrade for the LS50THa\u003c\/h3\u003e\n      \u003cp\u003eThe LS50C is engineered to maintain the portable, \"grab-and-go\" nature of the LS50THa telescope. It threads directly onto the front of the optical tube in seconds without requiring any tools or a return trip to the factory. This seamless integration ensures your compact solar setup remains lightweight and easy to manage on a photo tripod or small equatorial mount, making it the ideal high-contrast upgrade that doesn't sacrifice convenience.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLS50THa Specific:\u003c\/strong\u003e This module is designed exclusively for the Lunt LS50THa series of telescopes and is not intended for use with other models.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFront-Mount Filter:\u003c\/strong\u003e Attaches securely to the objective end of the telescope for quick installation and removal.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSafety Requirement:\u003c\/strong\u003e A Lunt blocking filter is required for safe operation. The LS50C is an etalon filter and cannot be used as a standalone solar filter.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the Lunt LS50C Double Stack Module?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Lunt LS50C is an external etalon filter designed specifically for the \u003cstrong\u003eLunt LS50THa 50mm solar telescope\u003c\/strong\u003e. Its purpose is to \"double stack\" the system by adding a second filter, which narrows the final bandpass and dramatically increases the contrast of features on the Sun's chromosphere, such as filaments, prominences, and plage.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the LS50C on my LS50THa telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstallation is simple and requires no tools. The \u003cstrong\u003eLS50C Double Stack Module\u003c\/strong\u003e threads directly onto the front of your existing LS50THa telescope's objective lens cell. Simply unthread the dew shield\/sun shade, thread the LS50C on until it is snug, and then re-attach the dew shield to the front of the LS50C.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat specific visual improvements can I expect with the LS50C Double Stack Module on the Sun's surface?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou will see a significant increase in surface detail. Vague textures seen in a single-stack view will resolve into distinct structures. With the \u003cstrong\u003eLS50C module\u003c\/strong\u003e, you can expect to see:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eDarker, more defined cores within filaments.\u003c\/li\u003e\n      \u003cli\u003eFine, thread-like details inside prominences.\u003c\/li\u003e\n      \u003cli\u003eClear separation of bright plage regions from the background chromosphere.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS50C a standalone solar filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNo, it is not.\u003c\/strong\u003e This is critically important for safety. The LS50C is an etalon filter only and must be used with a Lunt LS50THa telescope that contains a required Lunt blocking filter in the diagonal or focuser. Using the LS50C without a proper blocking filter will not protect your eyes and will result in permanent blindness.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill adding the LS50C make my LS50THa setup heavy or hard to balance?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The \u003cstrong\u003eLS50C\u003c\/strong\u003e is designed to be compact and lightweight specifically to preserve the portability of the LS50THa system. While it adds a small amount of weight to the front of the telescope, the total system remains manageable on Vixen-style mounts or even robust photo tripods, and re-balancing is typically straightforward.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt LS50C work with any other Lunt telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis module, the LS50C, is made specifically for the \u003cstrong\u003eLunt LS50THa 50mm dedicated solar telescope series\u003c\/strong\u003e. It is not designed to be compatible with other Lunt telescope models or solar filters from other brands.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS50CP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eNo items are listed in the box for this module.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt_Solar_Systems_LS50THaPT_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003eFor LS50THa Telescope\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967532921117,"sku":"LSS-LS50CP","price":1393.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LSS-LS50C.jpg?v=1770414042"},{"product_id":"lunt-ls152tha-solar-telescope-pressure-tuned","title":"Lunt LS152THa Solar Telescope - Pressure Tuned","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDedicated Hydrogen-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003eDoppler True Pressure Tuning System\u003c\/li\u003e\n\u003cli\u003eInternal High Definition (HD) Etalon\u003c\/li\u003e\n\u003cli\u003e100% Unobstructed Optical Design\u003c\/li\u003e\n\u003cli\u003eRack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eRequires Lunt Solar Blocking Filter (Sold Separately or User-Supplied)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt LS152THa Solar Telescope - Pressure Tuned\u003c\/h2\u003e\n      \u003cp\u003eAs the largest solar telescope currently available from Lunt, the LS152THa delivers the ultimate balance of resolution and image scale for dedicated solar astronomy. This refractor-based system uses a 100% unobstructed internal HD Etalon with a Doppler True Pressure Tuning system to reveal the Sun's chromosphere with breathtaking clarity. It is engineered for the intermediate to advanced observer who demands the highest level of detail for both visual observation and high-end digital imaging.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe Largest Unobstructed H-Alpha System from Lunt\u003c\/h3\u003e\n      \u003cp\u003eThe LS152THa is built around a large front objective and an unobstructed internal etalon. This design eliminates the central obstruction found in some other telescope designs, resulting in higher contrast and sharpness across the entire field of view. Paired with advanced high-contrast coatings, the optical system performs at the highest level, revealing fine granulation, intricate filamentary structures, and dynamic prominence details.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDoppler True Pressure Tuning for 3D Solar Views\u003c\/h3\u003e\n      \u003cp\u003eThe core of the LS152THa is its Doppler True Pressure Tuning system, which provides an order of magnitude more precision than other tuning methods. This system allows you to precisely shift the bandpass of the internal etalon, targeting solar features moving towards or away from you. When observing a filament on the solar disk, you can follow its structure from base to tip, creating an enhanced, three-dimensional-like viewing experience that is invaluable for both visual observers and researchers.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA Ready-to-Mount Optical Tube Assembly\u003c\/h3\u003e\n      \u003cp\u003eThe Lunt LS152THa arrives as a complete optical tube assembly, ready for your existing mount. The system includes a precision Rack \u0026amp; Pinion focuser for smooth, repeatable focusing, critical for high-magnification viewing and imaging. It also comes with mounting rings, a dovetail plate, a Red Dot Sun Finder for safe and easy aiming, and a durable, aluminum-reinforced case for transport and storage.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDay-to-Night and Multi-Wavelength Versatility\u003c\/h3\u003e\n      \u003cp\u003eWhile the LS152THa is a premier H-alpha instrument, its utility extends beyond a single wavelength. An optional, interchangeable CaK module is available, allowing you to study the Sun in the Calcium-K line through the same optical platform. Furthermore, with a special backing plate and focuser kit (sold separately), the entire telescope can be converted for nighttime astronomical use, turning your world-class solar scope into a high-quality refractor for deep-sky and planetary observing.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt LS152THa come with a blocking filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this is an Optical Tube Assembly (OTA) package and a \u003cstrong\u003eLunt Solar Blocking Filter is required for operation\u003c\/strong\u003e. You must either use a Lunt blocking filter you already own or purchase one separately. Lunt offers the B1200, B1800, and B3400 blocking filters, with the choice depending on your intended use (visual vs. imaging) and the sensor size of your camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Pressure Tuner on the LS152THa help when observing solar filaments?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Doppler True Pressure Tuning system allows you to make extremely fine adjustments to the observed wavelength. This lets you isolate features moving at different velocities relative to you. For a solar filament, you can tune from the light emitted at its base (on the chromosphere) through its structure as it extends towards or away from you, creating a remarkable 3D effect and revealing structural details that are otherwise invisible.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt LS152THa telescope at night?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The LS152THa is unique in that it can be converted for nighttime astronomical viewing. By purchasing the optional backing plate and focuser kit, you can reconfigure the telescope to function as a high-quality refractor for observing planets, the Moon, and deep-sky objects like star clusters and nebulae.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is 'Doppler True Tuning' in the Lunt LS152THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt is Lunt's proprietary, pressure-based system for adjusting the internal H-alpha etalon. By changing the air pressure in the etalon chamber, the system precisely controls the filter's central wavelength. This allows an observer to compensate for the Doppler effect, bringing into sharp contrast solar features that are moving at high velocity, such as active regions and eruptions.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the LS152THa over smaller Lunt solar telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary advantage of the Lunt LS152THa is its large, unobstructed aperture. This provides significantly higher resolution compared to smaller instruments, allowing you to see finer details in solar prominences, smaller structures within filaments, and the texture of the solar granulation and plage with greater clarity, especially at high magnification.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I do CaK solar observing with the Lunt LS152THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the LS152THa is a modular system. You can purchase an optional, interchangeable CaK (Calcium-K) module from Lunt. This allows you to switch from H-alpha to CaK observing, enabling the study of a different, higher-energy layer of the Sun's atmosphere through the same telescope platform.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS152THa OTA\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003eNo Blocking Filter, B1200, B1800, B3400 Blocking Filters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt_Solar_Systems_LS152THa_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"No Blocking Filter","offer_id":44967533183261,"sku":"LSS-LS152THa\/R\u0026P","price":10989.0,"currency_code":"CAD","in_stock":true},{"title":"B1200","offer_id":44967533216029,"sku":"LSS-LS152THa\/B1200","price":11619.0,"currency_code":"CAD","in_stock":true},{"title":"B1800","offer_id":44967533248797,"sku":"LSS-LS152THa\/B1800","price":11962.0,"currency_code":"CAD","in_stock":true},{"title":"B3400","offer_id":44967533281565,"sku":"LSS-LS152THa\/B3400","price":14731.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-LS152THa-Solar-Telescope-1__42980.1598291514.1280.1280.jpg?v=1684343560"},{"product_id":"lunt-internal-double-stack-module-for-ls152tha","title":"Lunt Internal Double Stack Module for LS152THa","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eInternal double-stack module for select Lunt modular telescopes\u003c\/li\u003e\n\u003cli\u003eDramatically narrows the final system bandpass for maximum contrast\u003c\/li\u003e\n\u003cli\u003eReveals fine chromospheric detail on the solar disk\u003c\/li\u003e\n\u003cli\u003eUser-installable design requires no factory return\u003c\/li\u003e\n\u003cli\u003eFully reversible, does not affect nighttime telescope configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eLunt Internal Double Stack Module for LS152THa\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LFPT Internal Double Stack Module is the definitive high-contrast upgrade for Lunt's largest modular solar telescopes. By adding a second, new-generation etalon inside the optical path, this module narrows the system's final bandpass to an extremely fine level. This significant reduction in bandpass delivers the highest-contrast Hydrogen-alpha views possible, transforming the solar disk into a landscape of intricate, dynamic detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Internal Double-Stack Etalon: Maximum Solar Contrast\u003c\/h3\u003e\n\u003cp\u003eThe core of this module is a second, precision-tuned etalon designed to work in series with your telescope's primary etalon. This \"double stacking\" drastically reduces the amount of off-band light reaching the eyepiece, which darkens the solar background and makes faint structures on the chromosphere stand out in bold relief. Each etalon is individually tested and verified on precision metrology equipment to ensure it meets its design specifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eResearch-Grade Chromosphere: Resolving Plage and Network Structure\u003c\/h3\u003e\n\u003cp\u003eWith the extreme bandpass reduction of the LFPT module, the Sun's chromosphere becomes a subject of genuine scientific study. The increase in contrast moves beyond simple prominences to reveal the complex magnetic architecture of active regions. You can resolve the fine internal organization of bright plage, trace the delicate threads of filaments against the disk, and resolve individual elements of the intergranular network.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Reversible Upgrade for Lunt Modular Telescopes\u003c\/h3\u003e\n\u003cp\u003eThis module is engineered for straightforward user installation, eliminating the need to send your telescope back to the factory for an upgrade. It can be purchased with a new telescope or added at any time, making it a flexible investment in your solar observing. The upgrade is also fully reversible; once the internal solar module is removed for nighttime use, the telescope performs exactly as it did before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSingle vs. Double-Stack: Visualizing the High-Contrast Advantage\u003c\/h3\u003e\n\u003cp\u003eA standard single-stacked Lunt telescope provides excellent views of solar prominences, which are bright features seen against the blackness of space. However, seeing faint details on the face of the Sun itself requires suppressing the overwhelming brightness of the chromosphere. This is the primary function of the double-stack module. By dramatically increasing contrast across the disk, it makes the intricate, low-contrast tapestry of filaments, plage, and active regions visible where they would otherwise be lost in the glare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main visual difference after installing the Lunt Double Stack Module on my LS152THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary difference is a dramatic increase in contrast on the surface of the Sun. While a single-stacked view is excellent for prominences at the Sun's edge, the \u003cstrong\u003eLunt Double Stack Module\u003c\/strong\u003e excels at revealing finer, lower-contrast details on the solar disk itself, such as filaments, plage, and the complex structure within active regions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to send my Lunt LS152THa telescope to the factory to install this module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Lunt LFPT Internal Double Stack Module is designed to be \u003cstrong\u003euser-installable\u003c\/strong\u003e. This allows you to upgrade your telescope at any time without the cost and downtime of shipping it for factory service.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill adding the Lunt Internal Double Stack Module affect my LS130MT's performance for nighttime astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it will not. The internal module is part of the solar assembly. When you configure your Lunt modular telescope for nighttime use, the solar components are removed, and the telescope operates as a standard night-sky instrument with its original optical characteristics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a narrower bandpass better for viewing the Sun's surface with the Lunt Double Stack Module?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Sun's surface, or chromosphere, is incredibly bright. Faint details are easily lost in this glare. A narrower bandpass, achieved by \"double stacking\" etalons, rejects more of this off-band light. This darkens the view slightly but significantly boosts contrast, making subtle features visible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see more detail in a large solar flare with the Lunt Double Stack Module on an LS152THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The enhanced contrast provided by the \u003cstrong\u003eLunt Double Stack Module\u003c\/strong\u003e is ideal for observing the complex, ribbon-like structures within a solar flare. While a single-stack system will show the event, the double-stack reveals finer details and the flare's connection to surrounding active regions on the solar disk more clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt Double Stack Module useful for imaging the Sun with my LS130MT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The high-contrast view is a major advantage for solar imagers. The \u003cstrong\u003eLunt Double Stack Module\u003c\/strong\u003e allows cameras to capture the same faint surface details that become visible to the eye, resulting in images with significantly more surface texture, filamentary detail, and active region complexity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eDSII\/LS130T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLFPT\/LS152mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLunt Internal Double Stack Module (LFPT)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt_Solar_Systems_LS152THa_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967533347101,"sku":"LSS-DSII\/LS152TP","price":4193.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"lunt-backing-plate-focuser-ls152t","title":"Lunt Backing Plate \u0026 Focuser - LS152T","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts the Lunt LS152THa solar telescope for nighttime astronomical use\u003c\/li\u003e\n\u003cli\u003eReplaces the rear pressure-tuner assembly\u003c\/li\u003e\n\u003cli\u003eFeatures a precision 2\" Crayford focuser\u003c\/li\u003e\n\u003cli\u003eAccepts standard 2\" and 1.25\" diagonals, eyepieces, and imaging accessories\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt Backing Plate \u0026amp; Focuser - LS152T\u003c\/h2\u003e\n      \u003cp\u003eThis Lunt Backing Plate \u0026amp; Focuser assembly converts your dedicated LS152THa solar telescope into a fully capable nighttime instrument, replacing the entire rear solar filtering and tuning assembly with a standard 2\" Crayford focuser to unlock the premium optics for deep-sky and planetary observation.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eUnlock Your LS152THa: From Solar to Night-Sky Observing\u003c\/h3\u003e\n      \u003cp\u003eYour Lunt LS152THa telescope is built around a superb objective lens, an optic too good to be limited to only viewing the Sun. This conversion kit allows you to leverage your investment after sunset by transforming the instrument into a high-end nighttime refractor. The process involves unthreading the rear H-alpha etalon and pressure tuner assembly and installing this custom-machined backing plate and focuser in its place.\u003c\/p\u003e\n      \u003cp\u003eThis simple swap gives you a dual-purpose telescope, capable of rendering high-contrast, detailed views of solar prominences by day and resolving faint details in galaxies like the Whirlpool Galaxy (M51) or splitting close double stars by night.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA Standard 2\" Crayford Focuser for Universal Accessory Compatibility\u003c\/h3\u003e\n      \u003cp\u003eAt the heart of this conversion is a robust 2\" Crayford focuser, the standard for serious astronomical observation. This zero-image-shift focuser provides the smooth, precise control needed for achieving critical focus at high magnifications on targets like Jupiter's cloud bands or the Cassini Division in Saturn's rings. The 2\" barrel accepts your entire collection of standard nighttime accessories, including 2\" diagonals, wide-field eyepieces, Barlow lenses, and imaging cameras, without the need for proprietary adapters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this Lunt back plate convert my LS152THa for nighttime use?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe kit replaces the entire rear solar assembly of your LS152THa—including the H-alpha etalon, blocking filter, and pressure tuner. You simply unthread the existing solar components and thread this backing plate and \u003cstrong\u003e2\" Crayford focuser\u003c\/strong\u003e in its place. This creates a direct, unobstructed light path from the objective lens to a standard astronomical eyepiece or camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the LS152THa conversion process difficult or permanent?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, the conversion is fully reversible and designed to be straightforward. It requires no special tools. You can switch between solar and nighttime configurations as needed, allowing you to use your LS152THa as a versatile, dual-purpose instrument. Always store your solar components carefully when not in use.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of nighttime performance can I expect on objects like the Orion Nebula (M42) from my LS152THa with this focuser installed?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith this conversion, your LS152THa functions as a high-quality refractor. You can expect sharp, high-contrast views typical of a premium air-spaced doublet. On the Orion Nebula (M42), you will be able to resolve the four main stars of the Trapezium and see extensive nebulosity, especially when paired with a wide-field 2\" eyepiece.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need any other accessories to use my Lunt LS152THa at night after installing this focuser?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. This kit provides the focuser, but you will need standard nighttime accessories to view an image. At a minimum, you will require:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eA 2\" or 1.25\" star diagonal\u003c\/li\u003e\n      \u003cli\u003eAt least one 2\" or 1.25\" eyepiece\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces like a Tele Vue Nagler with the Lunt LS152THa after this conversion?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. The \u003cstrong\u003e2\" focuser\u003c\/strong\u003e is designed to be compatible with all standard 2\" accessories, including heavy eyepieces like the Tele Vue Nagler and Ethos series. The Crayford design ensures smooth focusing action without slippage, even with a full imaging train attached.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this Lunt back plate work with any other Lunt solar telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this backing plate and focuser assembly is specifically designed and threaded for the Lunt \u003cstrong\u003eLS152THa\u003c\/strong\u003e model only. It is not compatible with other Lunt telescopes like the LS50THa, LS60THa, or LS100THa.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS152T\/BP\u0026amp;F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967533379869,"sku":"LSS-LS152T\/BP\u0026F","price":517.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Backing-Plate-Focuser__31510.1598288797.1280.1280.jpg?v=1684343563"},{"product_id":"lunt-ls230tha-double-stack-solar-telescope-pressure-tuned","title":"Lunt LS230THa Double Stack Solar Telescope - Pressure Tuned","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e230mm Unobstructed Aperture\u003c\/li\u003e\n\u003cli\u003e1,610mm Focal Length (f\/7)\u003c\/li\u003e\n\u003cli\u003eInternal Double-Stack Etalon System (~0.30Å Bandpass)\u003c\/li\u003e\n\u003cli\u003eDual PC-USB Pressure Tuner Controllers\u003c\/li\u003e\n\u003cli\u003eB3400 Blocking Filter (34mm Clear Aperture)\u003c\/li\u003e\n\u003cli\u003eStarlight Instruments 2\" Feather Touch Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eLunt LS230THa Double Stack Solar Telescope - Pressure Tuned\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS230THa is built around a 230mm f\/7 FLP51 air-spaced doublet objective, establishing it as the largest commercially available H-alpha solar telescope in the world. Its internal, double-stacked etalon system achieves a combined bandpass of approximately 0.30Å for maximum chromospheric contrast. The optical train terminates with a B3400 blocking filter, providing a 34mm clear aperture to illuminate large-format sensors at the scope's native 1,610mm focal length. This instrument is one of only five units ever to be produced.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe World's Only 230mm f\/7 Solar Refractor\u003c\/h3\u003e\n\u003cp\u003eAt 230mm of fully unobstructed aperture, the LS230THa is an instrument without peer. The f\/7 FLP51 air-spaced doublet objective is optimized from design to coating for the hydrogen-alpha wavelength of 656.28nm. The front element features a custom IR reflective coating that removes the bulk of solar thermal energy before it enters the optical tube, ensuring thermal stability for the precision etalons that follow.\u003c\/p\u003e\n\u003cp\u003eThis uncompromising focus on solar observation makes the LS230THa entirely unsuitable for night-sky use. It is a dedicated instrument designed to deliver the highest-resolution view of the solar chromosphere possible, limited only by the Earth's atmosphere—not its own optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHand-Matched ~0.30Å Double-Stack Etalon System\u003c\/h3\u003e\n\u003cp\u003eThe LS230THa is double-stacked as standard. The system pairs a 0.6Å etalon with a new-generation 0.35Å etalon, with the final combined bandpass for each of the five instruments verified at ~0.30Å. This is not a simple addition; each etalon pair is hand-matched and individually tested to ensure the combined system achieves peak uniformity and contrast across the full 230mm aperture.\u003c\/p\u003e\n\u003cp\u003eThe result is a view where chromospheric structures are rendered with definitive contrast. Filaments resolve into dark, multi-strand systems, active regions show clear fibril organization, and prominences at the limb reveal intricate internal threading and flow patterns.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHRG Filter and B3400 for a 34mm High-Contrast View\u003c\/h3\u003e\n\u003cp\u003eIntegral to the LS230THa's optical path is a High Resolution Glass (HRG) filter. This component eliminates the off-band solar continuum glow that can wash out faint details, producing a genuinely dark background. This maximizes the perceived contrast and three-dimensional texture of the chromosphere.\u003c\/p\u003e\n\u003cp\u003eThe light path terminates in an internal, Lunt-modified B3400 blocking filter. With 34mm of clear aperture, it fully illuminates even large imaging sensors, preventing vignetting and ensuring the entire 16mm solar disk image is delivered to the focal plane with maximum brightness and uniformity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual PC-USB Controllers for 0.3 PSI Doppler Precision\u003c\/h3\u003e\n\u003cp\u003eAt this aperture, remote control is essential. The LS230THa includes two PC-USB Pressure Tuner Controllers—one for each etalon—that allow for vibration-free tuning with an accuracy of 0.3 PSI. The system provides closed-loop feedback, automatically compensating for temperature changes to maintain a stable wavelength position.\u003c\/p\u003e\n\u003cp\u003eThis system transforms Doppler tuning from an art into a reproducible science. You can scan both etalons in tandem from the red to the blue wing of the H-alpha line, maintaining the ~0.30Å bandpass throughout. By recording the precise pressure values for specific line positions, you can return to them with 0.3 PSI repeatability, session after session, enabling systematic and calibrated studies of solar plasma velocities.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 1,610mm Focal Length Imaging System\u003c\/h3\u003e\n\u003cp\u003eThe LS230THa's 1,610mm focal length produces a solar image nearly 16mm in diameter, an ideal scale for capturing high-resolution detail with modern sensors. The mechanical backbone is a Starlight Instruments 2\" Feather Touch focuser with 10:1 fine focus reduction, providing the precision required to achieve critical focus at this image scale.\u003c\/p\u003e\n\u003cp\u003eFor the advanced imager, the dual PC-USB control system is the key to unlocking the telescope's full potential. It enables calibrated, repeatable Doppler imaging sequences that were previously the domain of professional observatories. This makes the LS230THa the most capable solar imaging platform available to the public for studying the dynamic, fast-moving events that define solar activity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Lunt LS230THa unsuitable for night sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt LS230THa is a dedicated solar telescope. Its entire optical system, from the IR-reflective coatings on the objective to the internal etalons and blocking filters, is designed to transmit light only at the 656.28nm hydrogen-alpha wavelength and reject all other light. This design makes it impossible to see stars, planets, or galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Lunt LS230THa's dual PC-USB pressure tuners over manual knobs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt the 230mm aperture and 1,610mm focal length of the LS230THa, even the slightest touch to the telescope introduces vibrations that degrade the image. The PC-USB controllers allow for \u003cstrong\u003eremote, vibration-free tuning\u003c\/strong\u003e. They also offer superior precision (0.3 PSI accuracy) and repeatability, enabling scientific-grade Doppler velocity studies by allowing you to return to exact bandpass positions across multiple observing sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt LS230THa's ~0.30Å bandpass help when imaging a solar flare's Doppler shift?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA solar flare involves plasma moving at high velocity toward or away from you. The narrow ~0.30Å bandpass allows you to isolate these movements with extreme precision. Using the PC-USB tuners, you can scan off the central H-alpha line into the \"blue wing\" (for approaching plasma) or \"red wing\" (for receding plasma), capturing the full velocity structure of the event with maximum contrast and detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does 'seeing-limited' mean for an observer using the Lunt LS230THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS230THa is capable of resolving details so fine that on most days, the limiting factor will be atmospheric turbulence (\"seeing\"), not the telescope's optics. The instrument will regularly outperform what the sky allows. On days of exceptional seeing, it will resolve the finest structures visible from the ground, such as individual spicules at the solar limb and supergranulation cell boundaries.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWith the Lunt LS230THa and B3400 blocking filter, can I image the entire solar disk on a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Lunt LS230THa produces a solar disk image of approximately 16mm at its focal plane. The B3400 blocking filter has a 34mm clear aperture, which is more than large enough to pass the entire image without vignetting. A full-frame sensor (typically 36mm x 24mm) will easily capture the entire solar disk with plenty of room to spare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the Lunt LS230THa use two different etalon generations (0.6Å and 0.35Å)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCombining etalons of different specifications is a complex optical challenge. For the limited run of the Lunt LS230THa, Lunt's engineers hand-matched a 0.6Å etalon with a new-generation 0.35Å unit to achieve the target combined bandpass of ~0.30Å. Each of the five systems required a unique matching process to find the optimal pair that would deliver consistent high-contrast performance across the entire 230mm aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS230THa\/PT\/B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e230mm (Unobstructed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1,610mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eFLP51 Air-Spaced Doublet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEtalon System\u003c\/td\u003e\n\u003ctd\u003eInternal Dual Pressure-Tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e~0.30Å (Combined)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eDual PC-USB Pressure Tuner Controllers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB3400 with 34mm Clear Aperture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eStarlight Instruments 2\" Feather Touch with 10:1 Reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Size at Focal Plane\u003c\/td\u003e\n\u003ctd\u003e~16mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e12-15V DC or 120\/240V AC (for controllers)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Battery Life\u003c\/td\u003e\n\u003ctd\u003e12+ Hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduction\u003c\/td\u003e\n\u003ctd\u003eLimited Edition (5 Units Total)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS230THa 230mm H-Alpha Telescope OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePC-USB Pressure Tuner Controller\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eObservatory-Grade Tube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967533412637,"sku":"LSS-LS230THa\/B3400","price":55993.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-LS230THa-Solar-Telescope-1__35689.1598291187.1280.1280.jpg?v=1684343576"},{"product_id":"lunt-ls300tha-solar-telescope-pressure-tuned","title":"Lunt LS300THa Solar Telescope - Pressure Tuned","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e300 mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eInternal, Unobstructed Etalon System\u003c\/li\u003e\n\u003cli\u003e\u0026lt;0.65 Angstrom Bandpass (Single Stack)\u003c\/li\u003e\n\u003cli\u003ePC-USB Controlled True Doppler Pressure Tuning\u003c\/li\u003e\n\u003cli\u003e3.5 inch Feathertouch Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eLunt LS300THa Solar Telescope - Pressure Tuned\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS300THa is a research-class instrument designed for uncompromising solar observation, built around a massive 300 mm aperture at an f\/7 focal ratio. Its internal, unobstructed etalon achieves a sub-angstrom bandpass of \u0026lt;0.65Å in its single-stack configuration, revealing intricate details in the Sun's chromosphere. For ultimate contrast, the double-stacked option narrows the bandpass to \u0026lt;0.45Å, while the entire system is controlled by a PC-USB True Doppler pressure tuning system and focused with a 3.5 inch Feathertouch focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUnprecedented Solar Resolution: The 300mm f\/7 Optical System\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of the LS300THa is its 300 mm objective, placing it in an elite class of solar telescopes. This immense aperture provides the resolving power necessary to observe the finest structures on the solar disk, from the intricate cellular pattern of granulation to the delicate, hair-like structure of spicules at the limb. The f\/7 focal ratio provides a large image scale, making it an ideal platform for high-resolution scientific imaging and detailed visual study.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSub-Angstrom Detail: \u0026lt;0.65Å Single \u0026amp; \u0026lt;0.45Å Double Stack Options\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the LS300THa is an internal, unobstructed etalon that delivers exceptional H-alpha views. The single-stack configuration provides a \u0026lt;0.65 Angstrom bandpass, which is ideal for showcasing bright, dramatic prominences erupting from the solar limb while retaining significant surface detail. For imagers and observers seeking the highest possible contrast on the solar disk, the optional double-stack system narrows the bandpass to a remarkable \u0026lt;0.45 Angstrom, enhancing the visibility of faint filaments and the complex, web-like chromospheric network.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePC-Controlled Precision: True Doppler Pressure Tuning\u003c\/h3\u003e\n\u003cp\u003eThe LS300THa employs Lunt's True Doppler pressure tuning system for precise, repeatable wavelength adjustment. Unlike mechanical systems, pressure tuning provides uniform transmission across the entire etalon by altering the refractive index of the air between its plates. This model features single or dual PC-USB computer control, allowing for remote and automated tuning routines essential for tracking Doppler-shifted phenomena like plasma ejections and inflows around active regions with scientific accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eResearch-Grade Mechanics: The 3.5-inch Feathertouch Focuser\u003c\/h3\u003e\n\u003cp\u003eTo match its optical capabilities, the LS300THa is equipped with a 3.5 inch Feathertouch focuser. This large-aperture, zero-image-shift focuser is engineered to handle the weight of heavy, research-grade cameras, filter wheels, and other instrumentation without flexure. Its fine-focus mechanism is critical for achieving perfect sharpness at the high magnifications and large image scales that the 300 mm optical system is capable of producing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the LS300THa's 300mm aperture for solar viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003e300 mm aperture\u003c\/strong\u003e is resolution. It allows you to resolve extremely fine solar features, such as the granulation cells covering the photosphere and the intricate, thread-like structures within solar prominences, that are simply too small to be seen in smaller-aperture solar telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the view differ between the LS300THa single stack (\u0026lt;0.65Å) and double stack (\u0026lt;0.45Å) when observing a solar filament?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a solar filament is visible in the \u003cstrong\u003e\u0026lt;0.65Å single-stack\u003c\/strong\u003e version, it appears as a dark line against the brighter chromosphere. In the \u003cstrong\u003e\u0026lt;0.45Å double-stack\u003c\/strong\u003e version, the contrast is significantly increased. The filament will appear much darker and more defined, and you will see more of its complex, multi-stranded structure against a darker background, making it \"pop\" off the solar disk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"True Doppler Pressure Tuning\" allow you to do with the LS300THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis system allows you to precisely shift the center of the filter's bandpass. Since solar features can be moving towards or away from us, their light is Doppler-shifted. The \u003cstrong\u003ePC-USB controlled pressure tuning\u003c\/strong\u003e lets you fine-tune the filter to see these high-velocity events, like the legs of a solar flare or plasma moving along magnetic field lines, which would be invisible if the filter were fixed at the exact H-alpha line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 3.5 inch Feathertouch focuser necessary on the LS300THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA telescope of this size and focal length produces a very large image and is intended for use with large-format, often heavy, imaging equipment. The \u003cstrong\u003e3.5 inch Feathertouch focuser\u003c\/strong\u003e provides the mechanical stability to carry this load without sagging or shifting, and its fine-focus control is essential for achieving critical sharpness when imaging at high resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does an \"internal, unobstructed\" etalon mean for the LS300THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn internal etalon is placed inside the main telescope tube, fully protected from the elements. Because it's a full-aperture filter placed after the main objective, it is \u003cstrong\u003eunobstructed\u003c\/strong\u003e, meaning there is no central obstruction in the light path (unlike a front-mounted etalon on an SCT). This design maximizes contrast and optical throughput for the purest possible solar image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Lunt LS300THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the exact weight is not specified, a 300 mm telescope is a very large and heavy instrument. The LS300THa requires a research-grade, high-capacity equatorial mount. You should consider mounts typically used for large observatory instruments, capable of handling well over 100 lbs of payload to ensure stability for high-resolution imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS300THa\/B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Type\u003c\/td\u003e\n\u003ctd\u003eDedicated H-alpha Solar Telescope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e300 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEtalon\u003c\/td\u003e\n\u003ctd\u003eInternal, unobstructed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (Single Stack)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.65 Angstrom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (Double Stack)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.45 Angstrom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTrue Doppler pressure tuning, single or dual PC-USB computer controlled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.5 inch Feathertouch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Single Stack","offer_id":44967533478173,"sku":"LSS-LS300THa\/B3400","price":117599.0,"currency_code":"CAD","in_stock":true},{"title":"Double Stack","offer_id":44967533510941,"sku":"LSS-LS300THa\/B3400\/DSII","price":151193.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-LS300THa-Solar-Telescope-1__28151.1598290452.1280.1280.jpg?v=1684343579"},{"product_id":"lunt-case-for-ls35tha","title":"Lunt Case for LS50THa - No foam","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for Lunt LS40THa \u0026amp; LS50THa Telescopes\u003c\/li\u003e\n\u003cli\u003eProvides a durable, protective hard shell\u003c\/li\u003e\n\u003cli\u003eRequires the original foam insert from your telescope box\u003c\/li\u003e\n\u003cli\u003eFoam is NOT included with this case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt Case for LS50THa - No foam\u003c\/h2\u003e\n      \u003cp\u003eThis Lunt hard case is the official protective shell for the custom foam inserts that ship with the Lunt LS40THa and LS50THa solar telescopes. If you have the original foam for your telescope and want to upgrade from the cardboard shipping box to a durable, transport-ready solution, this is the product you need. It provides a robust exterior to protect your instrument during storage and travel, ensuring your investment remains safe.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA Hard Shell for Your Lunt LS40THa or LS50THa Foam\u003c\/h3\u003e\n      \u003cp\u003eLunt Solar Systems ships its LS40THa and LS50THa telescopes in boxes with high-quality, die-cut foam designed for a perfect fit. This empty hard case allows you to transfer that existing foam from the original box into a more permanent and protective housing. It's the ideal way to add durability and portability to your solar setup without the expense of a case with pre-installed foam you don't need.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDirect Compatibility:\u003c\/strong\u003e Designed to the exact dimensions required by the factory foam inserts for the Lunt LS40THa and LS50THa.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUpgrade Your Protection:\u003c\/strong\u003e Move beyond the original cardboard shipping box to a hard case that better resists impacts, moisture, and dust.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePlease Note:\u003c\/strong\u003e This product is the case only. You must own the original foam insert from your telescope purchase to use it.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt Case for LS50THa come with foam?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eNo, this case does not include any foam.\u003c\/strong\u003e It is an empty hard shell specifically designed for you to insert the original foam that came with your Lunt LS40THa or LS50THa telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I buy the Lunt LS50THa case without foam?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou would purchase this case to provide a durable, protective housing for the foam your telescope already came with. It's an upgrade from the standard cardboard shipping box to a proper transport and storage case.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI damaged the original shipping box for my Lunt LS50THa. Is this the right replacement?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is the perfect replacement. Simply remove the foam insert from your damaged box and place it into this hard case to restore and upgrade your telescope's protection.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI own both a Lunt LS40THa and an LS50THa. Can I use this one case for both telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this case fits the foam inserts for both the Lunt LS40THa and LS50THa models. However, you would need to swap the corresponding foam insert each time you wanted to store a different telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Lunt case fit other telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis case is specifically designed for the foam inserts of the Lunt LS40THa and LS50THa. It is not guaranteed to fit other telescopes or foam sets.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the dimensions or weight of the Lunt LS50THa case?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe manufacturer does not specify the exact external dimensions or weight. It is engineered to be a precise fit for the stock foam that accompanies the LS40THa and LS50THa telescopes.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e006-011\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS50Case\/Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eLunt Hard Case (Empty)\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967535280413,"sku":"LSS-006-011","price":168.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/AluminumCase_1024X_47888fc1-e5a7-44ae-9e3f-57f06aa79c7e.jpg?v=1748354803"},{"product_id":"lunt-clamshell-mounting-rings-ls60tha-or-ls80tha","title":"Lunt Clamshell Mounting Rings - LS60THA or LS80THA","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for Lunt LS60THa \u0026amp; LS80THa Telescopes\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Black-Anodized Construction\u003c\/li\u003e\n\u003cli\u003eIntegrated 1\/4-20 Tapped Mounting Hole\u003c\/li\u003e\n\u003cli\u003eAccepts Tele Vue Sol-Searcher Sun Finder\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt Clamshell Mounting Rings for LS60THa \u0026amp; LS80THa\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt Clamshell Mounting Rings for the LS60THa and LS80THa solar telescopes offer a secure, heavy-duty mounting solution with a standard 1\/4-20 tapped base for versatile attachment to plates and tripods. This black-anodized ring is the official original equipment manufacturer (OEM) part, ensuring a perfect and secure fit for your telescope tube.\u003c\/p\u003e\n      \u003cp\u003eThis component is intended as a direct replacement for a lost or damaged part, or for observers creating a second, customized mounting setup. Please note that this clamshell ring is included as standard equipment in most new LS60THa and LS80THa telescope packages.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSecure Mounting with an Integrated 1\/4-20 Base\u003c\/h3\u003e\n      \u003cp\u003eThis heavy-duty clamshell is precisely machined to fit the tube of Lunt's LS60THa and LS80THa solar telescopes, preventing any flexure or slippage during observation. The design incorporates two essential features for solar observers: a dedicated slot at the top that accepts the Tele Vue Sol-Searcher for safe solar alignment, and a 1\/4-20 tapped hole in the base. This standard thread allows you to mount the telescope directly to a photographic tripod or attach it to a Vixen or Losmandy-style dovetail bar for use on an equatorial mount.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eMy Lunt LS60THa already has a clamshell. Why would I need to buy this one?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis Lunt Clamshell is sold primarily as a \u003cstrong\u003ereplacement part\u003c\/strong\u003e for a lost or damaged original ring. It is also useful for astronomers who wish to have a second mounting system for different setups without having to move the original clamshell.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I mount my LS80THa to a camera tripod using this Lunt Clamshell?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe clamshell features a standard \u003cstrong\u003e1\/4-20 tapped hole\u003c\/strong\u003e in its base. You can thread the mounting screw from any standard photographic or video tripod directly into the clamshell for a simple and stable alt-azimuth setup.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I attach a Tele Vue Sol-Searcher to the Lunt Clamshell?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The Lunt Clamshell has a \u003cstrong\u003ededicated slot\u003c\/strong\u003e at the top specifically designed to accept the base of the Tele Vue Sol-Searcher sun finder, allowing for quick and safe alignment with the Sun.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt Clamshell fit my LS50THa or LS100THa telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this clamshell is specifically designed for the tube diameter of the \u003cstrong\u003eLunt LS60THa and LS80THa\u003c\/strong\u003e models only. It will not fit other telescopes in the Lunt lineup.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt Clamshell include a dovetail bar?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, a dovetail bar is not included. The clamshell provides the \u003cstrong\u003e1\/4-20 threaded hole\u003c\/strong\u003e needed to attach the telescope to a separate Vixen or Losmandy-style dovetail bar of your choice.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"1\/4-20 tapped base\" on the Lunt Clamshell mean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis refers to the industry-standard screw thread size used on virtually all photographic tripods. The \"1\/4\" is the diameter in inches, and the \"20\" refers to 20 threads per inch. This ensures compatibility with a wide range of common mounting hardware.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eCLAM\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLunt LS60THa, Lunt LS80THa\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterial \/ Finish\u003c\/td\u003e\n\u003ctd\u003eBlack-Anodized Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMounting Thread\u003c\/td\u003e\n\u003ctd\u003e1\/4-20\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFinder Compatibility\u003c\/td\u003e\n\u003ctd\u003eAccepts Tele Vue Sol-Searcher\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eLunt Clamshell Mounting Ring\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967541244189,"sku":"LSS-CLAM","price":119.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Clamshell-CLAM__92106.1598224448.1280.1280.jpg?v=1684343632"},{"product_id":"lunt-40mm-double-stack-solar-filter-for-ls40tha","title":"Lunt 40mm Double Stack Solar Filter for LS40THa","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDouble-stack upgrade for Lunt LS40THa telescopes\u003c\/li\u003e\n\u003cli\u003eReduces system bandpass to \u0026lt;0.29Å\u003c\/li\u003e\n\u003cli\u003e40mm clear aperture\u003c\/li\u003e\n\u003cli\u003eFront-mounted, tilt-tuned etalon\u003c\/li\u003e\n\u003cli\u003eReveals high-contrast chromospheric detail\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eLunt 40mm Double Stack Solar Filter for LS40THa\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt 40mm Double Stack Solar Filter is the definitive contrast-enhancing upgrade for your LS40THa telescope, adding a second 40mm front-mounted etalon to slash the system's final bandpass to an exceptionally narrow \u0026lt;0.29Å. By placing two precision etalons in series, this filter dramatically increases contrast on solar surface features, transforming the Sun from a flat disk into a dynamic, three-dimensional sphere.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eDouble-Stacking the LS40THa for \u0026lt;0.29Å Bandpass\u003c\/h3\u003e\n      \u003cp\u003eThis filter adds a second, perfectly matched 40mm etalon to the front of your existing LS40THa solar telescope. The two filters working in series create a combined system bandpass of less than 0.29Å — the tightest available in any Lunt double-stack configuration. Installation is simple, requiring no tools or a return to the factory, allowing you to upgrade your view in minutes.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eRevealing High-Contrast Chromospheric Detail at \u0026lt;0.29Å\u003c\/h3\u003e\n      \u003cp\u003eThe significant bandpass reduction is not just a number; it translates directly to a stark increase in visible surface detail. With the LS40FHa installed, the solar chromosphere is rendered with striking clarity. Plage boundaries sharpen into cellular networks, dark filaments reveal their multi-strand internal structure, and the delicate threading within solar prominences becomes visible from base to tip.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eStandalone H-Alpha Filtration and Critical Safety Requirements\u003c\/h3\u003e\n      \u003cp\u003eWhile designed as an upgrade for the LS40THa, the LS40FHa can also serve as a primary H-alpha filter for a compatible customer-supplied refractor. However, for safe operation in any configuration, a Lunt blocking filter is mandatory. The LS40FHa etalon alone is not a complete safety device and must be paired with an appropriate blocking filter to prevent irreversible eye damage.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Lunt 40mm Double Stack Filter on my LS40THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstallation is straightforward and requires no tools. The LS40FHa filter simply threads onto the front objective of your existing Lunt LS40THa telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main visual benefit of double-stacking my LS40THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe primary benefit is a dramatic increase in \u003cstrong\u003esurface contrast\u003c\/strong\u003e. The tighter \u0026lt;0.29Å bandpass makes features like filaments, plage, and granulation \"pop\" against the solar disk, revealing details that are subtle or invisible in a single-stack system.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt LS40FHa filter on a telescope other than the LS40THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, it can be used as a standalone H-alpha filter on a compatible refractor. However, you \u003cstrong\u003emust\u003c\/strong\u003e pair it with a correctly sized Lunt blocking filter for safe solar observation. The etalon by itself is not sufficient for eye safety.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs a blocking filter included with the Lunt 40mm Double Stack Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This filter is designed as an add-on for the LS40THa telescope, which already includes a blocking filter. If you plan to use this on a different telescope, a separate Lunt blocking filter is required and must be purchased separately.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Lunt 40mm filter show more solar prominences than my single-stack LS40THa?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt will not necessarily show more prominences, as they are often bright enough to be seen in a single-stack view. However, the double-stacked view at \u0026lt;0.29Å will reveal significantly more \u003cstrong\u003einternal detail, structure, and texture\u003c\/strong\u003e within those prominences, which often appear as uniform shapes in a wider bandpass.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the LS40FHa achieve such a narrow bandpass compared to other Lunt systems?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe LS40FHa achieves its exceptionally narrow \u0026lt;0.29Å bandpass by placing two front-mounted, tilt-tuned etalons in series. This specific configuration results in a tighter combined bandpass than Lunt systems that pair a front-mounted filter with an internal, pressure-tuned etalon.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eLS40FHaP\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSystem Bandpass (Double Stacked)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.29Å\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEtalon Type\u003c\/td\u003e\n\u003ctd\u003eFront-Mount, Tilt-Tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eLunt LS40THa Series\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e40mm Double Stack Solar Filter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":50921462268189,"sku":"LSS-LS40FHa","price":973.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LSS-LS40FHa.png?v=1770413088"},{"product_id":"lunt-ls40tha-h-alpha-solar-telescope-standard-kit","title":"Lunt LS40THa H-Alpha Solar Telescope - Standard Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Aperture Dedicated Hydrogen-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003e≤0.65Å Bandpass Front-Mounted Tilt-Tuned Etalon\u003c\/li\u003e\n\u003cli\u003e6mm (B600) Blocking Filter for Visual and Imaging Use\u003c\/li\u003e\n\u003cli\u003eTele Vue Sol Searcher Solar Finder for Safe Aiming\u003c\/li\u003e\n\u003cli\u003eIncludes 12mm Eyepiece and Hard-Sided Carry Case\u003c\/li\u003e\n\u003cli\u003e400mm Focal Length (f\/10)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eManual\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eEnter the Chromosphere: The Lunt LS40THa Solar Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS40THa H-Alpha Solar Telescope is a complete, dedicated instrument designed to reveal the dynamic, ever-changing chromosphere of our sun. By combining a 40mm objective with a high-contrast, tilt-tuned etalon, this telescope delivers a direct, unfiltered view of solar prominences, filaments, and surface granulation, all in the brilliant crimson light of hydrogen-alpha.\u003c\/p\u003e\n\u003cp\u003eThis is the ideal starting point for any observer curious about dedicated solar astronomy. Its grab-and-go portability makes it a perfect companion for quick daytime sessions, while its optical system is engineered to provide a level of detail that generic white-light filters simply cannot resolve. With the LS40THa, you are not just looking at the sun; you are watching the active, violent weather of a star in real time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Matched 40mm f\/10 Optical System\u003c\/h3\u003e\n\u003cp\u003eThe foundation of the LS40THa is its 40mm singlet objective lens, operating at a focal ratio of f\/10. This specific focal length is engineered to provide a full-disc image of the sun with ample room around the limb. The f\/10 design ensures the light cone presented to the front etalon is nearly parallel, a critical requirement for achieving a uniform, high-contrast image across the entire field of view.\u003c\/p\u003e\n\u003cp\u003eThis aperture provides a perfect balance between resolution and sensitivity to atmospheric seeing. On days of average or poor seeing, a 40mm aperture often delivers a steadier, more pleasing view than a larger instrument, which can be over-magnified for the conditions. This makes the LS40THa a reliable performer, delivering consistent, satisfying views even when the atmosphere is turbulent.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHigh-Contrast Tilt-Tuned Etalon with ≤0.65Å Bandpass\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the LS40THa is its front-mounted, tilt-tuned Fabry-Pérot etalon. This precision filter isolates a narrow slice of the solar spectrum at the 656.28nm Hydrogen-alpha line, with a full-width half-maximum (FWHM) bandpass of ≤0.65Å. This narrow bandpass is essential for rejecting the overwhelming glare of the photosphere, allowing the faint, low-contrast structures of the chromosphere to become visible.\u003c\/p\u003e\n\u003cp\u003eThe simple and robust tilt-tuning mechanism allows you to shift the filter's bandpass slightly off the central H-alpha line. This control is vital for observing features that are Doppler-shifted due to their velocity, such as solar flares or fast-moving plasma in active regions. A slight turn of the tuning wheel can make a faint filament snap into sharp relief against the solar surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe B600 Blocking Filter\u003c\/h3\u003e\n\u003cp\u003eThe etalon works in concert with the B600 blocking filter, housed within the 90-degree star diagonal. The \"B600\" designation refers to its 6mm internal aperture, which is sized to pass the full solar disc from the 400mm focal length optical tube. This filter serves as the final, critical stage of the safety system, eliminating all out-of-band wavelengths and providing the observer with a purely monochromatic image.\u003c\/p\u003e\n\u003cp\u003eThe 6mm aperture of the B600 provides a generous field of view around the solar disc and is well suited for both visual observation and solar imaging. Whether you want to frame the entire sun and its surrounding prominences in a single view or capture high-resolution images of active regions and filaments, the B600 delivers a bright, high-fidelity image perfectly matched to the telescope's focal length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSimple and Precise Helical Focuser\u003c\/h3\u003e\n\u003cp\u003eFocusing on the sun requires small, deliberate adjustments, and the LS40THa's helical focuser is designed for this task. Unlike a rack-and-pinion focuser, a helical mechanism moves the eyepiece in and out with a simple rotation of the barrel. This design is compact, mechanically simple, and prevents any image shift during focusing.\u003c\/p\u003e\n\u003cp\u003eThe non-rotating action is a key benefit. It ensures that your eyepiece, or a camera if you are imaging, maintains its orientation as you fine-tune the focus. This makes it easier to keep your target framed and simplifies the process of achieving the sharpest possible view of delicate filamentary structures or the fine spicules at the solar limb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSafe and Fast Targeting with the Tele Vue Sol Searcher\u003c\/h3\u003e\n\u003cp\u003eAiming a telescope directly at the sun is inherently dangerous without a proper finder. The LS40THa includes the Tele Vue Sol Searcher for safe, precise solar acquisition. This is not an optical finder you look through; instead, it projects a small shadow or dot onto a small, white target screen, allowing you to center the sun without ever looking toward it.\u003c\/p\u003e\n\u003cp\u003eTo use it, you simply move the telescope tube until the indicator is centered on the target. This process is completely safe, intuitive, and takes only a few seconds. It eliminates any guesswork and ensures you can acquire and center the sun in the eyepiece quickly and confidently, getting you observing faster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMounting and Experiencing the View\u003c\/h3\u003e\n\u003cp\u003eThe included 4-inch Vixen-style dovetail bar makes the LS40THa compatible with a wide range of lightweight, portable astronomical mounts. It can be easily carried by a photo tripod with a fluid head or any entry-level equatorial or alt-azimuth mount, making it an excellent \"grab-and-go\" instrument.\u003c\/p\u003e\n\u003cp\u003eWith the included 12mm eyepiece, the telescope operates at 33x magnification. At this power, the entire solar disc is framed comfortably in the field of view. As your eye settles, you will first notice the sharp, well-defined limb. With a slight adjustment of the tilt-tuner, you will see immense prominences, appearing like ghostly red flames erupting from the edge. On the surface itself, dark, snaking filaments and bright, active regions (plage) become apparent, changing day by day.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTrade-Offs and Upgrade Path\u003c\/h3\u003e\n\u003cp\u003eThe primary trade-off for the LS40THa's portability and price is its aperture. While 40mm provides excellent full-disc views, it has a lower resolution ceiling than larger instruments like the LS60MT or LS80MT for observing fine surface detail. Its tilt-tuned etalon is also more susceptible to off-band transmission at the edge of the field compared to Lunt's internal pressure-tuned systems, though this is rarely an issue for visual observation.\u003c\/p\u003e\n\u003cp\u003eHowever, the LS40THa offers a powerful upgrade path. By adding the LS40FHa front-mounted double-stack filter (sold separately), you can dramatically increase contrast on surface features, making the solar disc appear almost three-dimensional. This allows the telescope to grow with your interest in solar astronomy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS40THa safe to use for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. It is a dedicated solar telescope with a multi-stage filtering system, including a front etalon and a rear blocking filter. It is engineered from the ground up for safe solar observation. You should never use a standard nighttime telescope with a simple front filter to view the sun.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat will I actually see with the LS40THa telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will see the sun's chromosphere in the red hydrogen-alpha wavelength. This includes solar prominences (eruptions on the edge), filaments (dark ribbons on the surface), active regions (bright areas called plage), and surface granulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the LS40THa compare to the Lunt LS50THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS50THa has a larger 50mm aperture, which provides slightly higher resolution on surface details under good seeing conditions. The LS40THa is smaller, lighter, and more affordable, making it a better choice for portability and as an entry point into solar astronomy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Lunt LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS40THa is very lightweight and will perform well on a sturdy photo tripod with a fluid video head. For better tracking and slow-motion control, an astronomical mount like the Sky-Watcher AZ-GTe or a Celestron NexStar SLT is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I take pictures of the sun with this telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, solar imaging is fully supported. You can use a dedicated astronomy camera or even a smartphone with an appropriate adapter. The B600 blocking filter's 6mm aperture is well suited for both visual use and imaging, delivering a bright, high-fidelity image across the full solar disc.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the \"double-stack\" filter upgrade?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAdding a second etalon (double-stacking) dramatically increases contrast on surface features like filaments and granulation, making them appear more detailed and pronounced. It has less effect on prominences at the limb.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Type\u003c\/td\u003e\n\u003ctd\u003eDedicated H-Alpha Solar Telescope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEtalon\u003c\/td\u003e\n\u003ctd\u003eInternal, Tilt-Tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.65 Ångström\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 (6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eHelical Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e4\" Vixen-Style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3 lbs (1.36 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminum Hard Case with Custom Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40THa H-Alpha Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHelical Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue Sol Searcher Solar Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4\" Vixen-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e12mm Solar Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHard-Sided Carry Case with Custom Foam\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/luntsolarsystems.com\/wp-content\/uploads\/2022\/01\/40mm-Universal-Manual.pdf\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 512 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51207735148829,"sku":"LSS-LS40THa-Standard-V1","price":1393.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LS40-nofinder.png?v=1779895608"},{"product_id":"lunt-ls40tha-h-alpha-solar-telescope-enhanced-kit","title":"Lunt LS40THa H-Alpha Solar Telescope - Enhanced Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Aperture Dedicated Hydrogen-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003eInternal Etalon with Tilt-Tuning for \u0026lt;0.55Å Bandpass\u003c\/li\u003e\n\u003cli\u003eEnhanced Kit with Upgraded 1:1 Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIncludes B600 Blocking Filter for a Wider Imaging Field\u003c\/li\u003e\n\u003cli\u003eIntegrated SunLock Solar Finder and Vixen-Style Dovetail\u003c\/li\u003e\n\u003cli\u003eComplete package includes a 12mm eyepiece and hard case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWatch the Sun Come Alive: The Lunt LS40THa Solar Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS40THa H-Alpha Solar Telescope - Enhanced Kit is a complete, grab-and-go system designed to reveal the dynamic, violent nature of our nearest star. This package is built around a 40mm dedicated solar refractor that makes the sun's chromosphere visible, transforming a quiet yellow disk into a landscape of fiery prominences, active regions, and delicate filaments. The Enhanced Kit provides key upgrades over the standard package, making it the right choice for observers who want a more refined operational experience and a clear path toward solar imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e40mm Aperture: Your Portable Window to the Chromosphere\u003c\/h3\u003e\n\u003cp\u003eThe LS40THa is built around a 40mm singlet objective lens with a 400mm focal length. This f\/10 system is intentionally designed for portability and performance under typical daytime seeing conditions. Atmospheric turbulence often limits the useful resolution of larger solar telescopes, allowing this compact instrument to deliver sharp, high-contrast views on days when bigger scopes struggle.\u003c\/p\u003e\n\u003cp\u003eThis aperture is ideal for observing the full solar disk in one field of view. It provides the perfect image scale to watch prominences erupt from the limb and track the evolution of active regions as they crawl across the sun's face. Its light weight means it can be mounted on any simple photo tripod or a small equatorial mount for easy tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTilt-Tuned Etalon for High-Contrast Views\u003c\/h3\u003e\n\u003cp\u003eThe heart of the LS40THa is its internal, front-mounted solid etalon. This precision filter is factory-set to a bandpass of less than 0.55 Angstroms, isolating the specific wavelength of hydrogen-alpha light. This narrow bandpass extinguishes the brilliant, overwhelming light from the photosphere, allowing the much fainter details of the chromosphere to become visible.\u003c\/p\u003e\n\u003cp\u003eTo fine-tune the filter for maximum contrast on different features, the telescope uses a simple and robust tilt-tuning mechanism. A small thumbwheel on the side of the optical tube physically tilts the etalon. This allows you to shift the filter's bandpass slightly, which causes surface features like filaments and plage to \"pop\" into view or enhances the delicate structure of prominences against the blackness of space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe B600 Blocking Filter Advantage\u003c\/h3\u003e\n\u003cp\u003eThe Enhanced Kit includes the upgraded B600 blocking filter, a critical component housed within the 90-degree star diagonal. This secondary filter provides the final, essential stage of energy rejection for safe observing. The \"600\" designation refers to its 6mm aperture, which is a significant step up from the standard B500 filter.\u003c\/p\u003e\n\u003cp\u003eThis larger clear aperture provides a wider, unvignetted field of view at the eyepiece. For visual observers, this results in a more evenly illuminated view of the full solar disk. For imagers, it is a mandatory upgrade, ensuring your camera sensor is fully illuminated edge-to-edge, preventing dimming in the corners of your solar images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUpgraded 1:1 Rack \u0026amp; Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eAnother key feature of the Enhanced Kit is the 1:1 rack and pinion focuser. This is a direct upgrade from the helical focuser found in the standard package, offering a more stable and precise focusing experience. The motion is smoother, making it easier to find that perfect point of sharp focus, especially at higher magnifications.\u003c\/p\u003e\n\u003cp\u003eThe rack and pinion design is also better at handling the weight of cameras and larger eyepieces without slipping or shifting. This non-rotating mechanism ensures your camera remains oriented correctly as you focus, eliminating the need to re-frame your shot after each adjustment. It is a practical upgrade that significantly improves the telescope's usability, particularly for imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eObserving with the LS40THa: A Live View of Solar Fury\u003c\/h3\u003e\n\u003cp\u003eWith the included 12mm eyepiece, the LS40THa operates at 33x magnification, a perfect power for framing the entire sun. After using the SunLock finder to safely center the disk, you will see a deep, ruby-red ball. As your eye adapts, the view transforms. Along the limb, you might see a hedgerow prominence, a wall of plasma arcing tens of thousands of miles into space, its structure changing over minutes.\u003c\/p\u003e\n\u003cp\u003eBy adjusting the tilt-tuner, the bright active regions on the surface darken, revealing the intricate, web-like structure of filaments snaking across the disk. One trade-off of the simple tilt-tune system is that it can create a slight brightness gradient, but this is easily managed by keeping your target of interest in the \"on-band\" sweet spot. This instrument makes observing the sun an active, engaging experience, not a passive one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLS40THa Kit Comparison: Finding Your Fit\u003c\/h3\u003e\n\u003cp\u003eLunt offers the LS40THa in several packages to match different observer goals. Understanding the trade-offs helps you make the right choice.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Kit:\u003c\/strong\u003e This entry-level package includes the same optics but uses a B500 blocking filter and a helical focuser. It's a capable choice for purely visual, casual solar observing where minimizing cost is the top priority.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Kit (This Model):\u003c\/strong\u003e By upgrading to the B600 blocking filter and the rack \u0026amp; pinion focuser, this kit offers a better visual experience and a solid foundation for basic solar imaging. It represents the sweet spot for performance and value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium PLUS Kit:\u003c\/strong\u003e This package includes the B600 filter, R\u0026amp;P focuser, and adds an external LS40FHa double-stack etalon. Double-stacking narrows the bandpass to \u0026lt;0.29Å, dramatically increasing surface contrast and making the chromosphere's texture appear almost three-dimensional. It is the ultimate choice for dedicated solar enthusiasts who demand the highest level of detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the B600 blocking filter in the Enhanced Kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe B600 blocking filter has a larger 6mm aperture compared to the standard 5mm B500. This provides a wider, more evenly illuminated field of view, which is better for imaging and for observing the full solar disk with certain eyepieces without dimming at the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS40THa good for solar imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Enhanced Kit is a great starting point for solar imaging. The upgraded rack \u0026amp; pinion focuser provides smoother, more stable focusing, and the B600 blocking filter illuminates the camera sensor more effectively than the standard B500.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I see sunspots with this H-alpha telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile this telescope is designed to view the chromosphere (prominences, filaments), you can see the dark umbra of very large sunspots. However, for detailed views of sunspot structure in the photosphere, a white-light solar filter on a standard nighttime telescope is the proper tool.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the LS40THa compare to the LS50THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS50THa has a larger 50mm aperture, which provides slightly higher resolution and a brighter image. The LS40THa is smaller, lighter, and more affordable, making it an excellent portable or entry-level option that still delivers excellent views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I upgrade this telescope to a double-stack system later?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You can purchase the Lunt LS40FHa front-mounted etalon separately at any time. This filter threads onto the front of your LS40THa, easily converting it to a double-stack system for significantly higher-contrast views of surface detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS40THa is very lightweight (under 4 lbs) and includes a Vixen-style dovetail. It works well on a simple alt-azimuth mount like a Vixen Porta II, a Sky-Watcher AZ-GTe, or even a sturdy photographic tripod with a fluid video head.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Type\u003c\/td\u003e\n\u003ctd\u003eDedicated H-alpha Solar Telescope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.55 Ångström\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt-Tuned Internal Etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 (6mm) in 90° Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1.25\" Rack \u0026amp; Pinion Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eIntegrated SunLock Vixen-style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.8 lbs (1.7 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40THa Telescope Optical Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in 1.25\" Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSunLock Vixen-Style Dovetail (4\")\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLunt 12mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHard Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/luntsolarsystems.com\/wp-content\/uploads\/2022\/07\/LS40THa_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/luntsolarsystems.com\/warranty-registration\/\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51221379711261,"sku":"LSS-LS40THa-Enhanced","price":1533.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS40THa-Enhanced-Kit.jpg?v=1777426716"},{"product_id":"lunt-ls40tha-h-alpha-solar-telescope-premium-plus-kit","title":"Lunt LS40THa H-Alpha Solar Telescope - Premium PLUS Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Dedicated H-Alpha Solar Telescope\u003c\/li\u003e\n\u003cli\u003eInternal Double-Stack System with ≤0.35Å Bandpass\u003c\/li\u003e\n\u003cli\u003eB600 Blocking Filter for Full-Disk Views \u0026amp; Imaging\u003c\/li\u003e\n\u003cli\u003eIncludes Lunt 7.2mm - 21.5mm Zoom Eyepiece\u003c\/li\u003e\n\u003cli\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIntegrated SunLock Solar Finder\u003c\/li\u003e\n\u003cli\u003e4\" Vixen-Style Dovetail Rail\u003c\/li\u003e\n\u003cli\u003eIncludes Aluminum Hard Case with Custom Foam\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eThe Ultimate View of Solar Surface Detail in a 40mm Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS40THa H-Alpha Solar Telescope - Premium PLUS Kit is a complete, dedicated system designed to reveal the sun's dynamic chromosphere with the highest contrast possible in this aperture. By including a matched double-stack etalon filter, this kit narrows the bandpass to ≤0.35Å, transforming faint surface texture and active regions into a richly detailed, three-dimensional spectacle. It is the definitive choice for the observer who prioritizes surface contrast over all else in a portable, grab-and-go package.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMatched 40mm f\/10 Optics\u003c\/h3\u003e\n\u003cp\u003eThe foundation of the LS40THa is a 40mm f\/10 singlet objective lens, fully corrected for the 656.28nm hydrogen-alpha wavelength. This focal ratio provides a manageable 400mm focal length, creating a forgiving system for focus and tuning. The optical design ensures a high-contrast image is delivered to the etalon filtering system, a critical first step for high-resolution solar viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrimary Tilt-Tuned Etalon Filter\u003c\/h3\u003e\n\u003cp\u003eThe heart of the telescope is its internal, front-mounted etalon. This precision filter uses a polished Fabry-Pérot cavity to isolate the light from hydrogen plasma, revealing the sun's chromosphere. The user tunes the filter to the precise H-alpha line by tilting the etalon with a simple thumbwheel, allowing you to shift the view slightly off-band to emphasize Doppler-shifted features like erupting prominences moving toward or away from you.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLS40FHa Double-Stack Etalon for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThis Premium PLUS kit includes the crucial LS40FHa front-mounted double-stack etalon. Adding this second filter dramatically narrows the system's bandpass from the standard ~0.55Å to a very tight ≤0.35Å. This reduction in out-of-band light significantly increases the contrast of surface features, causing solar flares, filaments, and active region plage to stand out against the solar disk with stark definition. While a single-stack system shows you these features exist, the double-stack renders them with photographic-like texture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eB600 Blocking Filter for Full-Disk Views\u003c\/h3\u003e\n\u003cp\u003eThe B600 blocking filter, housed in the star diagonal, is the final stage of the safety system and is sized to provide an unvignetted view of the entire solar disk with the included zoom eyepiece. This larger 6mm filter provides more clearance than the smaller B500, making it a better choice for observers who may want to try basic imaging of the full sun with a small sensor camera. It ensures the entire solar limb is visible at once, so you never miss a prominence erupting at the edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Experience of High-Contrast Chromosphere Viewing\u003c\/h3\u003e\n\u003cp\u003eWith the double-stack engaged and the zoom eyepiece set to around 12mm, the experience is unlike any white-light view. After tuning the etalon, the solar surface resolves into a tapestry of texture. You can trace the dark, serpentine path of a filament as it snakes across an active region, then watch as its delicate structure appears to float just above the brighter background. This is the view that turns a static star into a living, dynamic object, and the ≤0.35Å bandpass is what makes it possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUpgraded Focuser and SunLock Finder\u003c\/h3\u003e\n\u003cp\u003eThe Premium PLUS kit features an upgraded 1:1 Rack \u0026amp; Pinion focuser, which offers a smoother feel and better stability for holding cameras compared to the standard helical focuser. Finding the sun is made safe and simple by the integrated SunLock finderscope, a small pinhole that projects an image of the solar disk onto a tiny internal screen. When the dot is centered, the sun is in your eyepiece, eliminating any guesswork or unsafe alignment attempts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eLunt Zoom Eyepiece and Hard Case\u003c\/h3\u003e\n\u003cp\u003eCompleting the kit is the Lunt 7.2mm - 21.5mm zoom eyepiece, the ideal companion for a solar telescope. It allows you to frame the entire solar disk at 21.5mm (18.6x magnification), then zoom in to 7.2mm (55.5x) to scrutinize a specific sunspot group or prominence without ever taking your eye from the view. The entire system, including the double-stack filter, packs into a custom-cut foam-lined aluminum hard case for secure transport and storage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Note on Aperture and Seeing\u003c\/h3\u003e\n\u003cp\u003eWhile larger solar telescopes exist, the 40mm aperture is often an advantage under typical daytime seeing conditions. Atmospheric turbulence can easily degrade the view in larger scopes, but the LS40THa is less susceptible to these effects, frequently delivering a sharper, more stable image than a larger instrument on an average day. This makes it a highly effective and frustration-free grab-and-go solar telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Premium PLUS (double-stack) kit?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Premium PLUS kit includes a second etalon filter that narrows the bandpass to ≤0.35Å. This dramatically increases the contrast of features on the sun's surface, like filaments and active regions, making them appear much more detailed and defined compared to the single-stack version.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Lunt solar telescope safe to use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Lunt LS40THa is a dedicated solar telescope with multiple, permanently installed filters. As long as it is used as designed and is not modified, it is completely safe for direct solar observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my own eyepieces with the LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can use any standard 1.25\" eyepiece. However, non-solar-specific eyepieces may have coatings that produce reflections or glare (ghosting) when viewing the extremely bright sun. The included Lunt zoom eyepiece is optimized for this application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 40mm Lunt compare to the 50mm Lunt telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt LS50THa offers 25% more aperture, providing slightly higher resolution on fine surface details under good seeing conditions. The LS40THa is smaller, lighter, and often performs better under average or poor seeing, making it a more consistent and portable option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this telescope use tilt-tuning instead of pressure-tuning?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTilt-tuning the front etalon is a simpler and more cost-effective mechanism for a telescope of this size, allowing Lunt to deliver high-quality etalon performance at an accessible price point. Lunt's larger telescopes use pressure-tuning for more uniform control over the filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I do astrophotography with the Lunt LS40THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can perform basic solar imaging with the LS40THa. It is suitable for capturing full-disk images or close-ups of large features using a small, lightweight planetary-style CMOS camera. Achieving focus may require a 1.25\" eyepiece extender.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003eSingle Stack: \u0026lt;0.55Å, Double Stack: ≤0.35Å\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt-Tuned Etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 (6mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1:1 Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e4\" Vixen-Style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.1 lbs (1.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40THa 40mm H-alpha Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS40FHa Double-Stack Etalon Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLunt 7.2mm - 21.5mm Zoom Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIntegrated SunLock Solar Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4\" Vixen-Style Dovetail Rail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Hard Case with Custom Foam\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/luntsolarsystems.com\/wp-content\/uploads\/2022\/10\/40mm_Instructions_2022.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/luntsolarsystems.com\/product-registration-and-warranty\/\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51221379744029,"sku":"LSS-LS40THa-Premium","price":2513.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS40THa-Premium-PLUS-Kit.jpg?v=1777426717"},{"product_id":"lunt-ls50tha-h-alpha-solar-telescope-standard-kit","title":"Lunt LS50THa H-Alpha Solar Telescope - Standard Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 50mm\u003c\/li\u003e\n\u003cli\u003eFocal Length: 350mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/7\u003c\/li\u003e\n\u003cli\u003eBandpass: \u0026lt;0.6Å\u003c\/li\u003e\n\u003cli\u003eTuning: Internal Pressure Tuner (Doppler True Tuning)\u003c\/li\u003e\n\u003cli\u003eBlocking Filter: B400 (4mm)\u003c\/li\u003e\n\u003cli\u003eFocuser: Helical Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eObserve the Sun's Dynamic Atmosphere in Hydrogen-Alpha\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS50THa is a dedicated hydrogen-alpha solar telescope designed to reveal the intricate, ever-changing details of the sun's chromosphere. This complete system combines a 50mm objective with Lunt's proprietary pressure-tuned etalon, delivering high-contrast views of prominences, filaments, and surface granulation. It offers a significant step up in resolution and tuning precision from entry-level solar filters, making it the right choice for the serious visual observer who demands performance and portability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e50mm Objective: The Sweet Spot for Solar Viewing\u003c\/h3\u003e\n\u003cp\u003eThe 50mm precision-polished objective lens provides the ideal balance between light-gathering power and sensitivity to atmospheric seeing. Under typical daytime conditions, this aperture resolves fine details in sunspot umbra and delicate filamentary structures without being overly compromised by turbulence. The 350mm focal length (f\/7) creates a full-disc view of the sun with low-power eyepieces, while still having enough image scale for satisfying high-magnification views of active regions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInternal Etalon with Doppler True Pressure Tuning\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the LS50THa is its internal, unobstructed Fabry-Pérot etalon. By placing the etalon inside the telescope body, Lunt protects the critical component from damage and ensures thermal stability. The single etalon provides a narrow \u0026lt;0.6Å bandpass, which is the specification required to resolve high-contrast details against the bright solar disc.\u003c\/p\u003e\n\u003cp\u003eLunt’s Doppler True Tuning system uses air pressure to make fine adjustments to the etalon's bandpass. Unlike mechanical tilt-tuning which can introduce off-axis aberrations, pressure tuning provides a uniform, consistent view across the entire field. This allows you to shift the filter's transmission window to track features moving at high velocity, like eruptive prominences or plasma flows around active regions, without any degradation in image quality.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eB400 Blocking Filter for Visual Safety and Contrast\u003c\/h3\u003e\n\u003cp\u003eThis Standard Kit includes the B400 blocking filter, housed in a 1.25\" star diagonal. The blocking filter is a non-negotiable safety component, removing all harmful radiation outside the H-alpha line before the light reaches your eye. The 4mm aperture of the B400 is optimized for visual observation, providing a fully illuminated field of view for full-disc observation without any vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSimple and Effective Helical Focuser\u003c\/h3\u003e\n\u003cp\u003eFocusing is managed by a robust helical focuser. This simple, intuitive design is easy to use, especially when wearing gloves in colder weather. While it lacks the fine control of a dual-speed Crayford, the helical focuser provides a direct, backlash-free mechanism for achieving a sharp image, which is perfectly adequate for the visual magnifications this telescope is designed for. The trade-off for simplicity is that the eyepiece and any attached camera will rotate during focus adjustment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSafe and Fast Solar Alignment with the SunLock Finder\u003c\/h3\u003e\n\u003cp\u003eThe integrated SunLock sun finder makes aiming the telescope safe and effortless. This small internal projection system casts a tiny image of the solar disc onto a white screen. To align the telescope, you simply adjust your mount until the projected image is centered on the screen. This system entirely eliminates the danger and difficulty of trying to find the sun through the main scope or a traditional finder.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eObserving a Hedgerow Prominence with the LS50THa\u003c\/h3\u003e\n\u003cp\u003eCenter a large active region on the limb of the sun and insert a medium-power eyepiece, around 8mm to 12mm. As your eye adapts, you will see the bright, boiling texture of the chromosphere. Slowly turn the pressure tuning knob. The surface details will fade slightly as the bandpass shifts, and suddenly, fiery structures will leap into view off the limb.\u003c\/p\u003e\n\u003cp\u003eA classic hedgerow prominence, which looks like a soft glow in a lesser instrument, resolves into a forest of fine, feathery plasma tendrils. With the LS50THa's pressure tuner, you can follow these structures as they arch and twist, sometimes seeing brighter knots of material that indicate areas of intense magnetic activity. This direct, real-time view of the sun’s violent atmosphere is what makes a dedicated H-alpha telescope an essential instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Lunt 50mm Solar Telescope\u003c\/h3\u003e\n\u003cp\u003eLunt offers several packages for the 50mm platform, each tailored to a specific use case. This Standard Kit is the ideal starting point for a dedicated visual observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Standard Kit (This Model):\u003c\/strong\u003e Features the B400 blocking filter and a helical focuser. It is the most affordable and portable package, perfectly matched for visual observation and getting started in H-alpha.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Enhanced Kit:\u003c\/strong\u003e Upgrades to a B600 blocking filter and a 10:1 Rack \u0026amp; Pinion focuser. The larger blocking filter is better suited for imagers using cameras with larger sensors, and the focuser provides more precise control, which is critical for photography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Premium PLUS Kit:\u003c\/strong\u003e Includes the B600 blocking filter, R\u0026amp;P focuser, and an external LS50C double-stacking etalon. This configuration narrows the bandpass to \u0026lt;0.3Å, dramatically increasing surface contrast to make filaments and active regions appear almost three-dimensional. This is the ultimate package for the high-resolution observer or imager.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the Lunt LS50THa B400 and B600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe B400 (4mm) and B600 (6mm) refer to the aperture of the blocking filter. The B400 is optimized for visual use, providing a fully illuminated field for full-disc views. The B600 provides a larger illuminated field, which is recommended for observers who plan to do solar imaging with cameras that have larger sensors to prevent vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I upgrade the LS50THa to a double-stack system later?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You can add the Lunt LS50C front-mounted etalon at any time. This screws onto the front of the telescope and, when used with the internal etalon, reduces the system bandpass to under 0.3Å. This significantly increases contrast on solar surface details like filaments and plage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the LS50THa good for taking pictures of the sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS50THa is capable of basic solar imaging with small, lightweight planetary-style cameras. However, the helical focuser can make achieving critical focus for imaging a challenge. For users primarily interested in imaging, the Enhanced Kit with the 10:1 Rack \u0026amp; Pinion focuser is a better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Lunt LS50THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS50THa is very lightweight and compact. It will perform well on a solid photo tripod with a fluid video head, or a light astronomical alt-azimuth mount like a Vixen Porta Mount II or Sky-Watcher AZ-GTe. An equatorial mount is not necessary for visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the pressure tuner different from a tilt tuner?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLunt's pressure tuner adjusts the etalon by changing air pressure, which keeps the filter perfectly parallel to the light path. This provides a very even, high-fidelity view across the entire field. Tilt-tuning, used on some other solar scopes, physically tilts the etalon, which can introduce some image degradation off-axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to see solar flares?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, solar flares are visible in H-alpha as intensely bright patches near active regions. The LS50THa has the resolution and contrast required to show them clearly. The pressure tuner helps you dim the surrounding plage to make the flare stand out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Aperture\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEFL\u003c\/td\u003e\n\u003ctd\u003e350 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF\/Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.6 Ångström @ 656nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eDoppler True Tuning (Pressure Tuning)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB400 in 1.25\" Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1.25\" Helical Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eClamshell with 1\/4-20 tapped holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminum Finished Hard Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.6 lbs (2.1 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS50THa 50mm H-Alpha Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB400 Blocking Filter in Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eIntegrated SunLock Sun Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTelescope Clamshell Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4\" Vixen-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e12mm Lunt Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Hard Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS50THa-Solar-Telescope-Manual.pdf?v=1777432302\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51230513529117,"sku":"LSS-LS50THa-Standard","price":1673.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LuntLS50THASolarTelescopeStandardKit.jpg?v=1777667488"},{"product_id":"lunt-ls50tha-h-alpha-solar-telescope-enhanced-kit","title":"Lunt LS50THa H-Alpha Solar Telescope - Enhanced Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 50mm\u003c\/li\u003e\n\u003cli\u003eBandpass: \u0026lt;0.6Å Single-Stack\u003c\/li\u003e\n\u003cli\u003eTuning: Doppler True Tuning (Pressure Tuner)\u003c\/li\u003e\n\u003cli\u003eFocuser: 1:1 Rack \u0026amp; Pinion\u003c\/li\u003e\n\u003cli\u003eBlocking Filter: B600 (6mm)\u003c\/li\u003e\n\u003cli\u003eFocal Length: 350mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/7\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eA High-Contrast Window on the Active Sun\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS50THa H-Alpha Solar Telescope - Enhanced Kit is a complete, dedicated instrument engineered for the observer who wants to move beyond basic solar views into high-contrast detail. By combining a 50mm aperture with an upgraded focuser and a larger blocking filter, this package delivers a significant performance step-up for resolving the dynamic, fine-scale structure of the Sun's chromosphere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 50mm Hydrogen-alpha Etalon\u003c\/h3\u003e\n\u003cp\u003eThe heart of the LS50THa is its precision front-mounted etalon, a solid-cavity filter with a bandpass specification of less than 0.6 Angstroms. This narrow window on the spectrum isolates the deep red light of hydrogen-alpha, revealing the Sun not as a bright disc, but as a turbulent body of plasma. The 50mm aperture provides a 25% increase in light-gathering power over 40mm scopes, resulting in brighter images and the ability to use higher magnifications on delicate prominence structures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDoppler True Tuning with the Lunt Pressure Tuner\u003c\/h3\u003e\n\u003cp\u003eLunt's Doppler True Tuning system uses air pressure to adjust the etalon's bandpass, a method with distinct advantages over mechanical tilt-tuning. Applying pressure changes the refractive index of the air between the etalon plates, shifting the filter's central wavelength without tilting the etalon itself. This maintains a more uniform bandpass across the entire field of view, preventing off-axis hot-spotting and delivering higher-contrast views from edge to edge.\u003c\/p\u003e\n\u003cp\u003eThis tuning control is what allows you to see the motion of solar plasma. As a filament or prominence erupts towards or away from you, its light is Doppler-shifted. By adjusting the pressure tuner, you can follow that motion into the \"wings\" of the H-alpha line, transforming a static view into a dynamic one and revealing the three-dimensional structure of active regions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe Upgraded 1:1 Rack \u0026amp; Pinion Focuser\u003c\/h3\u003e\n\u003cp\u003eThe Enhanced Kit replaces the standard helical focuser with a more robust 1:1 Rack \u0026amp; Pinion unit. This is a critical upgrade for detailed observation. The R\u0026amp;P focuser provides smoother, more precise travel with zero image shift, allowing you to achieve and hold critical focus on faint, wispy prominence details that a less stable focuser can struggle with. This makes the observing experience more fluid and less frustrating, especially at higher powers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eB600 Blocking Filter for a Wider Field\u003c\/h3\u003e\n\u003cp\u003eThis kit includes the 6mm B600 blocking filter, an important step up from the B400 found in the standard package. The larger aperture of the blocking filter provides a wider, fully illuminated field of view, reducing vignetting (dimming at the edges) when using lower-power, wide-field eyepieces. For observers who enjoy framing the entire solar disc with room to spare, or for those starting out with imaging, the B600 provides a more forgiving and complete picture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eObserving the Solar Limb\u003c\/h3\u003e\n\u003cp\u003eWith a medium-power eyepiece, the LS50THa presents the full solar disc against a truly black background. As your eye adapts, focus on the limb. A small, bright eruption that appears as a detached spike is a classic prominence. Using the pressure tuner, you can subtly adjust the view, watching as the finest thread-like details within the prominence sharpen and seem to float above the edge of the Sun. This ability to fine-tune the contrast is what separates a simple glance from a detailed study.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eReady for Double-Stacking for Ultimate Contrast\u003c\/h3\u003e\n\u003cp\u003eThe LS50THa is designed to be compatible with the optional LS50C front-mounted double-stack filter. Adding this second etalon is the single most effective upgrade for this telescope. It narrows the system's bandpass to less than 0.30 Angstroms, dramatically increasing contrast on the solar surface. This transforms faint filaments and plage from subtle shadings into bold, high-definition features, revealing the \"carpet\" of the chromosphere in a way a single-stack system cannot.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this increase in surface detail is a slightly dimmer image, which is why starting with a single-stack system is often recommended. However, the modular design means your investment is secure, with a clear and powerful upgrade path available when you are ready to see the highest possible level of solar detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch3\u003eLunt Solar Telescope Kit Comparison\u003c\/h3\u003e\n\u003cp\u003eLunt offers the LS50THa in several packages to match different observing goals and budgets. Understanding the trade-offs in focuser type and blocking filter size is key to selecting the right system for your needs.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Kit:\u003c\/strong\u003e The most accessible entry point. It includes the same 50mm etalon but uses a helical focuser and a smaller B400 (4mm) blocking filter. This is an excellent visual package, but the B400 can introduce vignetting with very low-power eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Kit (This Product):\u003c\/strong\u003e The observer's sweet spot. It upgrades two key components: the focuser is a smoother 1:1 Rack \u0026amp; Pinion, and the blocking filter is the larger B600 (6mm). These changes provide a better experience for detailed visual work and entry-level imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium PLUS Kit:\u003c\/strong\u003e The ultimate 50mm package. This kit includes the 1:1 R\u0026amp;P focuser, B600 filter, and bundles the LS50C front-mounted double-stack filter from the start. This delivers the highest-contrast surface views possible with the 50mm system, right out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the real difference between the B600 and B400 blocking filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe B600 has a 6mm aperture versus the B400's 4mm. This provides a wider, fully illuminated field of view, which reduces the dimming you might see at the edge of the field with low-power eyepieces. The B600 is recommended for those who want to do any form of imaging or prefer expansive, full-disc views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs double-stacking the LS50THa worth it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is the most significant performance upgrade you can make. Adding the LS50C filter narrows the bandpass to \u0026lt;0.30Å, which dramatically increases contrast on the Sun's surface. Filaments, active regions, and plage become much more defined. The trade-off is a slightly dimmer image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this kit have a Rack \u0026amp; Pinion focuser instead of a helical one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Rack \u0026amp; Pinion (R\u0026amp;P) focuser in the Enhanced Kit provides smoother, more precise focus control than the helical focuser in the standard kit. It is less prone to image shift, which is critical when trying to achieve sharp focus on faint solar details at high magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use my regular nighttime eyepieces with this solar telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, any standard 1.25\" astronomical eyepiece will work. Simpler designs with fewer glass elements, like Plössls, often perform very well for solar viewing by maximizing contrast and brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS50THa good for a beginner in solar astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe LS50THa is an excellent choice for a serious beginner. It is a complete, dedicated system that is easy to set up and provides high-quality views that will keep you engaged for years. The Enhanced Kit is particularly good as the upgraded focuser and blocking filter address the first upgrades many new observers consider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need any other filters to observe the sun safely?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The LS50THa is a complete, dedicated solar telescope. The internal etalon and the blocking filter in the diagonal work together to make viewing 100% safe. You must never use a front-mounted white-light filter with this telescope, nor should you ever remove the blocking filter diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Type\u003c\/td\u003e\n\u003ctd\u003eDedicated H-alpha Solar Telescope\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e350 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.6 Angstrom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eInternal Pressure Tuner (Doppler True Tuning)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 (6mm) in 1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1:1 Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eVixen-style Dovetail Plate (4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.6 lbs (2.1 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminum Hard Case with Custom Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt LS50THa H-Alpha Telescope\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS50THa-Telescope.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS50THa 50mm H-alpha Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt B600 Blocking Filter Diagonal\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-B600-Blocking-Filter.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in 1.25\" Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt 1:1 Rack \u0026amp; Pinion Focuser\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-RP-Focuser.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt 8mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-8mm-Eyepiece.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8mm Lunt Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt 12mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-12mm-Eyepiece.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e12mm Lunt Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt 16mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-16mm-Eyepiece.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e16mm Lunt Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt SunLock Solar Finder\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-SunLock-Finder.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSunLock Solar Finder\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Lunt Telescope Hard Case\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-Telescope-Case.jpg?v=1781295601\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHard Case with Custom Foam\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS50THa-Solar-Telescope-Manual.pdf?v=1777432302\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51230513627421,"sku":"LSS-LS50THa-Enhanced","price":1953.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LuntLS50THASolarTelescopeEnhancedKit.jpg?v=1777667525"},{"product_id":"lunt-ls50tha-h-alpha-solar-telescope-premium-plus-kit","title":"Lunt LS50THa H-Alpha Solar Telescope - Premium PLUS Kit","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 50mm\u003c\/li\u003e\n\u003cli\u003eSystem Bandpass: \u0026lt;0.30Å (Double-Stacked)\u003c\/li\u003e\n\u003cli\u003eTuning: Internal Pressure Tuner (Doppler True Tuning)\u003c\/li\u003e\n\u003cli\u003eBlocking Filter: B600 in 1.25\" Diagonal\u003c\/li\u003e\n\u003cli\u003eFocuser: 1:1 Rack \u0026amp; Pinion\u003c\/li\u003e\n\u003cli\u003eFocal Length: 350mm\u003c\/li\u003e\n\u003cli\u003eIncluded Eyepiece: Lunt Zoom Eyepiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003c!-- TAB-MARKER-1: DESCRIPTION --\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eFrom Prominences to Chromosphere: A Complete H-Alpha System\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS50THa H-Alpha Solar Telescope - Premium PLUS Kit is a complete, dedicated system designed to deliver high-contrast, high-resolution views of the Sun's dynamic chromosphere. This package combines a 50mm primary objective with two precision-tuned etalons, achieving a sub-0.30 Angstrom bandpass for the most detailed solar observation possible in this aperture class. It is the right choice for the observer who wants to move beyond limb phenomena and resolve the intricate, evolving texture of the solar disk itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 50mm f\/7 Optical Foundation\u003c\/h3\u003e\n\u003cp\u003eThe heart of the LS50THa is its 50mm f\/7 singlet objective lens. This aperture provides a significant increase in resolving power over smaller 40mm scopes, rendering finer detail in solar prominences and the structure within sunspot umbrae. The 350mm focal length creates a manageable image scale that is well-matched to the included B600 blocking filter and zoom eyepiece, allowing you to frame the full solar disk or zoom in on active regions without needing Barlows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInternal Pressure-Tuned Etalon for Uniformity\u003c\/h3\u003e\n\u003cp\u003eInside the main optical tube lies the primary sub-aperture etalon, the core filtering engine of the telescope. Lunt's innovative pressure tuning system adjusts the air pressure within the etalon cavity, shifting the filter's bandpass with zero mechanical stress on the optics. This Doppler True Tuning method provides a more uniform view across the entire field compared to mechanical tilt-tuning, which can introduce bandpass variations and gradients from the center to the edge of the view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDouble-Stacking for a High-Fidelity Chromosphere\u003c\/h3\u003e\n\u003cp\u003eThe Premium PLUS kit's defining feature is the included LS50C front-mounted double-stack etalon. Adding this second filter dramatically narrows the system's final bandpass from ~0.6Å to less than 0.30Å. This is not a subtle change; the reduction in out-of-band light significantly increases contrast on the solar disk, causing faint filaments, active region plage, and the mottled \"orange peel\" texture of the chromosphere to snap into sharp relief. While a single-stack system excels at prominences, this double-stack configuration is optimized for revealing the complex, three-dimensional surface of the Sun.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe B600 Blocking Filter: A Matched System\u003c\/h3\u003e\n\u003cp\u003eThe blocking filter, housed in the star diagonal, is the final critical component in the safety chain. This kit includes the B600, with a 6mm aperture perfectly suited for visual observation and imaging with smaller-chip cameras. It provides a generous field around the solar disk at the native 350mm focal length, ensuring you never suffer from a vignetted or cut-off view of the Sun's limb and surrounding prominence activity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUpgraded Focuser and Versatile Zoom Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThis kit moves beyond the helical focuser of the standard package to a more robust 1:1 Rack \u0026amp; Pinion focuser. This design is better equipped to handle the weight of cameras and multiple eyepieces without flexure, providing a more stable and repeatable focusing experience. Paired with the included Lunt Zoom eyepiece, you can move from a full-disk contextual view to high-magnification close-ups of an active region with a simple twist, maintaining focus and keeping your target centered.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSunLock Finder for Safe and Fast Alignment\u003c\/h3\u003e\n\u003cp\u003eFinding and centering the Sun without looking at it is the first challenge of any solar observation. The included SunLock is a purpose-built solar finder that projects a small image of the Sun onto a viewing screen. Simply center the dot on the screen, and the Sun will be in the eyepiece field of view, eliminating any guesswork and ensuring a safe, immediate start to your session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAn Observer's View: Filaments on the Grid\u003c\/h3\u003e\n\u003cp\u003eWith the double-stack engaged and the pressure tuner dialed in, point the LS50THa at a large, snaking filament. At low power with the zoom eyepiece, it appears as a dark, irregular line against the brighter chromosphere. As you increase magnification, what was a simple line resolves into a structure with depth and texture. You can trace its path across the solar grid, noting the finer, thread-like extensions and anchor points that betray the powerful magnetic forces holding it in place against the Sun's surface. This is the view a \u0026lt;0.30Å bandpass makes possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSystem Trade-offs and Considerations\u003c\/h3\u003e\n\u003cp\u003eThe principal trade-off for the enhanced surface detail of the double-stack system is a slight dimming of the image compared to the single-stack configuration. While prominences remain bright and clear, the double-stack view prioritizes disk contrast over limb brightness. The 50mm aperture provides excellent detail but may be more susceptible to poor atmospheric seeing than a smaller 40mm scope, which can sometimes provide a steadier, albeit less resolved, image under turbulent daytime skies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eChoosing Your Lunt 50mm Solar Telescope\u003c\/h3\u003e\n\u003cp\u003eLunt offers the LS50THa in several packages, each designed for a specific observer. The Premium PLUS Kit represents the pinnacle of the 50mm line, offering the highest-contrast views and most complete accessory package.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Standard Kit:\u003c\/strong\u003e This is the entry point, featuring a single etalon (\u0026lt;0.6Å), B400 blocking filter, and helical focuser. It is an excellent choice for focusing purely on solar prominences, offering the brightest possible view of structures on the Sun's limb.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Enhanced Kit:\u003c\/strong\u003e This package upgrades the blocking filter to the B600 for a wider field of view and moves to the 1:1 Rack \u0026amp; Pinion focuser. It remains a single-stack system, making it a great option for those who want a better focuser and a more complete view of the disk but do not yet require the highest surface contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLS50THa Premium PLUS Kit:\u003c\/strong\u003e The subject of this page. By adding the LS50C double-stack filter, this kit achieves the narrowest bandpass (\u0026lt;0.30Å) for maximum chromospheric detail. It is the definitive choice for the serious visual observer or imager who prioritizes resolving filaments, plage, and granulation over all else.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c!-- TAB-MARKER-2: FAQ --\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main difference between single-stack and double-stack solar telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA single-stack telescope (~0.6Å) provides bright, high-contrast views of prominences on the Sun's edge. A double-stack system (\u0026lt;0.30Å) narrows the filter bandpass, which dims the image slightly but dramatically increases contrast on the Sun's surface, making features like filaments and active regions much more detailed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the LS50THa Premium PLUS Kit good for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is well-suited for imaging with small-chip, high-frame-rate planetary-style cameras. The \u0026lt;0.30Å bandpass is ideal for capturing high-contrast surface detail, and the upgraded Rack \u0026amp; Pinion focuser can better support the weight of a camera setup than a helical focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does Lunt use pressure tuning instead of tilt tuning?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePressure tuning adjusts the etalon's bandpass without tilting it, which ensures a more uniform image and prevents off-axis reflections or gradients in the view. It is a more advanced method that maintains the highest performance across the entire solar disk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a special mount for the LS50THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the LS50THa is very lightweight and compact. It will perform well on any light-duty astronomical mount with a Vixen-style saddle, such as a Sky-Watcher AZ-GTi, an iOptron SkyGuider Pro with a ball head, or any small equatorial mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this telescope for night sky viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the LS50THa is a dedicated solar telescope. Its internal filters are designed specifically for viewing the Sun in the Hydrogen-alpha wavelength and will not pass enough light from stars or planets for nighttime observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the B600 and B1200 blocking filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe B600 (6mm) blocking filter included in this kit is ideal for visual use and imaging the full solar disk. A larger B1200 (12mm) filter would provide a wider illuminated field, which is primarily a benefit for imagers using cameras with larger sensors to create mosaics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c!-- TAB-MARKER-3: SPECIFICATIONS --\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Aperture\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e350 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.6 Angstrom (Single-Stack) \/ \u0026lt;0.30 Angstrom (Double-Stacked)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eInternal Pressure Tune (Doppler True Tuning)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003eB600 in 1.25\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e1:1 Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eVixen-Style Dovetail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminum Hard Case with Custom Foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.4 lbs (2 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003c!-- TAB-MARKER-4: IN THE BOX --\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS50THa 50mm H-Alpha Solar Telescope\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS50C Front-Mount Double-Stack Etalon Filter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eB600 Blocking Filter in 1.25\" Star Diagonal\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1:1 Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLunt Zoom Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSunLock Sol Searcher\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4\" Vixen-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Hard Case with Custom Foam\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c!-- TAB-MARKER-5: MANUAL --\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS50THa-Solar-Telescope-Manual.pdf?v=1777432302\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLS50THa Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-LS50FHa-Double-Stack-Manual.pdf?v=1777432302\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDouble-Stack Filter Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c!-- TAB-MARKER-6: WARRANTY --\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":51230513692957,"sku":"LSS-LS50THa-Premium","price":2933.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/LuntLS50THASolarTelescopePremiumKit.jpg?v=1777667542"}],"url":"https:\/\/davidastro.com\/collections\/lunt-tha-h-alpha-solar-telescopes.oembed","provider":"David Astro","version":"1.0","type":"link"}