{"title":"Lunt Solar Filters","description":"\u003cp\u003eLunt solar filters cover H-alpha, Calcium K and white light observing. The range includes B600, B1200 and B1800 blocking filters for H-alpha and Calcium K, 50mm and 60mm Ha etalon filters, double stack modules for THa and MT telescopes, a high resolution H-alpha filter for DS modules, an ERF unit and a 2\" Herschel wedge.\u003c\/p\u003e\u003cp\u003eLarger blocking filters give a wider field for full-disk imaging, while double stacking narrows the bandpass for more contrast on surface detail.\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-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-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-50mm-ha-etalon-filter","title":"Lunt 50mm Ha Etalon Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm Clear Aperture\u003c\/li\u003e\n\u003cli\u003eTilt-Tuned Hydrogen-Alpha Etalon\u003c\/li\u003e\n\u003cli\u003eVerified Bandpass of \u0026lt;0.4Å\u003c\/li\u003e\n\u003cli\u003eEnables \u0026lt;0.28Å Double-Stacking on LS60MT\u003c\/li\u003e\n\u003cli\u003eFront-Mount Filter Design\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 H-alpha Etalon Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt 50mm Ha Etalon Filter is a 50mm aperture, front-mounted, tilt-tuned solar filter with a verified bandpass of less than 0.4Å. It is designed as a direct-fit double-stack upgrade for the Lunt LS60MT telescope, combining with the scope's internal 0.45Å etalon to achieve an ultra-narrow system bandpass of less than 0.28Å for maximum contrast on solar surface details.\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 the LS60MT: Achieving a \u0026lt;0.28Å Bandpass\u003c\/h3\u003e\n\u003cp\u003eThis filter's primary purpose is to enhance the Lunt LS60MT Modular Telescope. By mounting the 50mm LS50FHa to the front of the LS60MT, its \u0026lt;0.4Å etalon is placed in series with the telescope's internal \u0026lt;0.45Å pressure-tuned etalon. This combination narrows the final bandpass to less than 0.28Å, dramatically increasing contrast and revealing fine structures within the Sun's chromosphere, such as filaments and active region plages, that are subtle or invisible in a single-etalon system. The upgrade is user-installable with no factory service required and is easily removed for nighttime astronomy.\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\u003eStandalone Solar Filter: A 50mm, \u0026lt;0.4Å Front Etalon for Refractors\u003c\/h3\u003e\n\u003cp\u003eBeyond the LS60MT, the LS50FHa can serve as a standalone 50mm H-alpha filter for a compatible, user-supplied refractor. The tilt-tuning mechanism allows you to shift the bandpass off the central H-alpha line, helping to highlight Doppler-shifted details like eruptive prominences. When used in this configuration, a crucial trade-off is the requirement for an appropriate Lunt blocking filter, which must be purchased separately and matched to your telescope's focal length to ensure safe viewing and proper system performance.\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 double-stacking my Lunt LS60MT with the LS50FHa filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDouble-stacking your LS60MT with the \u003cstrong\u003eLunt 50mm Ha Etalon Filter\u003c\/strong\u003e narrows the system's bandpass from ~0.45Å to under 0.28Å. This significant increase in spectral resolution dramatically boosts contrast on the solar disk, making surface details like granulation, plages, and the intricate structure of filaments appear much more defined.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt 50mm Ha Etalon Filter on a telescope other than the LS60MT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The LS50FHa can function as a primary, front-mounted H-alpha filter on a compatible refractor with up to 50mm of aperture. However, to create a safe and functional solar telescope, you \u003cstrong\u003emust\u003c\/strong\u003e pair it with a correctly sized Lunt blocking filter installed at the eyepiece end of your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the LS50FHa's tilt-tuning work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eLunt 50mm Ha Etalon Filter\u003c\/strong\u003e uses a mechanical tilt mechanism to slightly angle the etalon relative to the incoming light. This angle shifts the filter's central wavelength, allowing you to fine-tune the view for the best contrast or to study features that are Doppler-shifted, such as fast-moving ejecta in a solar flare.\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 LS60MT to the factory to install the LS50FHa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The LS50FHa is designed for easy, at-home installation. It threads directly onto the front of the Lunt LS60MT telescope, requiring no special tools or factory service. This allows you to easily switch between single-stacked, double-stacked, and nighttime configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the LS50FHa help me see solar prominences versus surface granulation on the Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile a single-stack system shows prominences well, the high-contrast view from double-stacking with the LS50FHa excels at revealing faint, low-contrast surface details. The intricate \"salt and pepper\" texture of solar granulation and the bright, web-like patterns of plages around sunspots become significantly more visible with the \u0026lt;0.28Å bandpass.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 60mm f\/6 refractor. Can I use the LS50FHa on it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the LS50FHa filter itself has a 50mm aperture, you could use it on your 60mm refractor by stopping the telescope's aperture down to 50mm. To complete the system for your f\/6 (360mm focal length) telescope, you would need to add a Lunt B600 blocking filter for visual use. Using an undersized etalon is a common practice for creating a portable solar scope.\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\u003eLS50FHaP\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\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eFront-Mount Hydrogen-Alpha Etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (Single)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.4Å\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt-Tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Compatibility\u003c\/td\u003e\n\u003ctd\u003eLunt LS60MT (as double-stack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass (Double-Stacked on LS60MT)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.28Å\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 50mm Ha 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\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_LS50FHa_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":44967533543709,"sku":"LSS-LS50FHaP","price":1603.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-50mm-Etalon-LS50FHa-1__41937.1598241417.1280.1280.jpg?v=1684343584"},{"product_id":"lunt-60mm-ha-etalon-filter","title":"Lunt 60mm Ha Etalon Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e60mm Aperture\u003c\/li\u003e\n\u003cli\u003e0.4Å Bandpass H-Alpha Filter\u003c\/li\u003e\n\u003cli\u003eTilt-Tuned Etalon\u003c\/li\u003e\n\u003cli\u003eDouble-Stacks Lunt 60mm Scopes to \u0026lt;0.28Å\u003c\/li\u003e\n\u003cli\u003eFront-Mount Filter Design\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 60mm Ha Etalon Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt 60mm Ha Etalon Filter delivers the high-contrast views of a verified 0.4Å bandpass through its 60mm front-mounted etalon. This filter serves a dual role, capable of either converting a standard refractor into a dedicated solar telescope or double-stacking a compatible Lunt 60mm system to achieve a bandpass of less than 0.28Å for maximum surface detail.\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 Verified 0.4Å Bandpass in a 60mm Aperture\u003c\/h3\u003e\n      \u003cp\u003eThis filter's core is a 60mm unobstructed etalon, precision-tuned to a 0.4Å bandpass at the hydrogen-alpha wavelength. Unlike filters with estimated specifications, every Lunt LS60FHa is individually tested using precision metrology equipment to guarantee its performance. The tilt-tuning mechanism allows you to shift the bandpass slightly, providing the ability to dial in the highest contrast on solar features experiencing Doppler shift, such as filaments and active regions.\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\u003eAchieve \u0026lt;0.28Å Contrast on Your Lunt 60mm Telescope\u003c\/h3\u003e\n      \u003cp\u003eFor owners of a Lunt LS60MT or LS60THa telescope, the LS60FHa acts as a powerful double-stacking upgrade. By mounting this second etalon to the front of your existing telescope, you narrow the system's final bandpass to under 0.28Å. This dramatic reduction in bandwidth significantly increases contrast across the solar disk, revealing finer texture in the chromosphere and rendering filaments with a striking, three-dimensional appearance against a darker sky background.\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\u003eConvert Any Refractor into a 60mm H-Alpha Solar Scope\u003c\/h3\u003e\n      \u003cp\u003eThe LS60FHa can also serve as the primary objective filter for a custom solar telescope built around your own nighttime refractor. When paired with a compatible Lunt blocking filter, this front-mounted 60mm etalon transforms your refractor into a high-resolution H-alpha instrument. Because it mounts on the front, it is easily removable, allowing you to quickly return your telescope to its original configuration for night sky 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\"\u003eTo use the Lunt LS60FHa on my own refractor, what else do I need?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eUsing the LS60FHa as a standalone filter requires a \u003cstrong\u003eLunt Blocking Filter\u003c\/strong\u003e, which must be purchased separately. The blocking filter is a critical safety component that removes harmful UV and IR radiation and is essential for the etalon to function correctly. You must select a blocking filter appropriately sized for your telescope's focal length.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the visual difference when I double-stack my LS60THa with the LS60FHa to view a solar flare?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA single-stacked LS60THa provides excellent views, but double-stacking to achieve a \u003cstrong\u003e\u0026lt;0.28Å bandpass\u003c\/strong\u003e dramatically increases contrast. When viewing a flare or filament, the feature will appear darker and more defined against a more uniform, darker solar disk. This enhanced contrast often reveals subtle structural details that are washed out at 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 tilt-tuning on the LS60FHa work?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe tilt-tuning mechanism physically angles the etalon relative to the incoming light. This slight tilt shifts the filter's central wavelength, allowing you to \"tune\" into the precise wavelength of solar features that may be slightly blue- or red-shifted due to their velocity relative to us (Doppler effect). This allows you to maximize contrast on specific active regions or filaments.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 100mm refractor. Will the LS60FHa give me a 100mm H-alpha view?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The LS60FHa has a clear aperture of \u003cstrong\u003e60mm\u003c\/strong\u003e. When placed on the front of any telescope, it acts as a 60mm aperture stop. Your 100mm refractor will perform as a 60mm H-alpha solar telescope, with its resolution and light-gathering ability limited to that of a 60mm instrument.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt LS60FHa difficult to install for double-stacking?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstallation is straightforward. The LS60FHa is designed to thread directly onto the front of compatible Lunt 60mm telescopes, such as the LS60MT and LS60THa. No tools are required, and the process typically takes less than a minute, making it easy to add or remove based on your observing goals for the day.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does a \"verified\" 0.4Å bandpass on the LS60FHa mean?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIt means that Lunt Solar Systems individually tests each LS60FHa etalon with precision metrology instruments to confirm it meets the \u003cstrong\u003e0.4Å\u003c\/strong\u003e specification. This provides assurance that you are receiving a filter that performs to the stated level of contrast, rather than one based on a design estimate or batch testing.\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\u003eLS60FHaP\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFront-Mount H-Alpha Solar Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e0.4Å\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\u003eDouble-Stack Bandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.28Å (with compatible Lunt scope)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLunt LS60MT, Lunt LS60THa\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_LS60THaPT_Solar_Telescope_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":"Default Title","offer_id":44967533609245,"sku":"LSS-LS60FHa","price":2093.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-60mm-Etalon-LS60FHa-1__05476.1645560455.1280.1280.jpg?v=1684343588"},{"product_id":"lunt-b600-blocking-filter","title":"Lunt B600 Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e6mm Blocking Filter Aperture\u003c\/li\u003e\n\u003cli\u003eRequired safety component for all Lunt H-alpha etalon systems\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" star diagonal housings\u003c\/li\u003e\n\u003cli\u003eAvailable in a 2\" straight-through housing for imaging\u003c\/li\u003e\n\u003cli\u003eAll housings include a T2 thread for secure camera connection\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 B600 Blocking Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt B600 Blocking Filter is the essential safety and performance component for any Lunt H-alpha solar viewing system, featuring a 6mm aperture designed for visual work with shorter focal length telescopes. Available in multiple housings including 1.25\" and 2\" star diagonals or a 2\" straight-through tube, each configuration provides a standard T2 thread for direct camera attachment. This filter is not optional; it contains a unique, multi-filter system that is critical for safe solar observation in the hydrogen-alpha wavelength.\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 Essential 6mm Safety Component for Lunt H-alpha Systems\u003c\/h3\u003e\n      \u003cp\u003eA Lunt blocking filter is a mandatory part of your complete H-alpha solar telescope. It houses the additional filters required for safe, high-contrast views of solar prominences and surface detail. Lunt can only warranty the safety and optical performance of their systems when a Lunt etalon is paired with a matching Lunt blocking filter like this 6mm B600 model.\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\u003eChoosing the B600 for Visual vs. Imaging Use\u003c\/h3\u003e\n      \u003cp\u003eSelecting the correct blocking filter depends entirely on your telescope's focal length and your intended application. The 6mm B600 is the ideal starting point for visual observation with short focal length refractors. However, solar imaging requires more back focus than an eyepiece, moving the camera sensor further up the light cone. To avoid vignetting your image, Lunt recommends choosing the next larger blocking filter (like the B1200) for imaging applications to ensure the sensor is fully illuminated.\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\u003eB600 Housing Formats: 1.25\" and 2\" Diagonal or Straight-Through Configurations\u003c\/h3\u003e\n      \u003cp\u003eTo integrate with any equipment setup, the B600 is offered in several housings. The 1.25\" and 2\" star diagonal versions provide a comfortable 90-degree viewing angle for visual use. For dedicated imaging trains where minimizing components is key, the 2\" straight-through tube offers a direct, secure light path. All options include a T2 male thread for a rigid connection to most astronomy cameras.\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\u003eLunt B600 (6mm) vs. B1200 (12mm): When to Step Up in Aperture\u003c\/h3\u003e\n      \u003cp\u003eThe primary difference between Lunt blocking filters is their clear aperture, which determines the size of the solar image they can pass without vignetting.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLunt B600 (6mm):\u003c\/strong\u003e Best suited for visual observation with telescopes of shorter focal length. It provides a generous field for viewing the full solar disk in these instruments.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLunt B1200 (12mm):\u003c\/strong\u003e Becomes necessary for telescopes with longer focal lengths or for any imaging application. Its larger aperture accommodates the wider light cone created by increased back focus, preventing the edges of the solar disk from being clipped on a camera sensor.\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 B600 Blocking Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Lunt B600 is a required safety component for any Lunt Solar Systems H-alpha etalon. It contains a series of secondary filters that block harmful radiation and heat, while also enhancing the contrast of solar features. It is not an optional accessory; your Lunt etalon will not perform correctly or safely without it.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B600 Blocking Filter with a non-Lunt etalon?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. Lunt blocking filters are designed as part of an integrated system. Lunt only warranties the safety and performance of their products when their etalons are paired with a corresponding Lunt blocking filter. Using it with other systems is not recommended and can be unsafe.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eShould I get the B600 or B1200 for my Lunt LS50THa telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor purely \u003cstrong\u003evisual use\u003c\/strong\u003e with the Lunt LS50THa, the B600 is perfectly adequate and will show the full solar disk. However, if you plan to do any \u003cstrong\u003eimaging\u003c\/strong\u003e, it is strongly recommended to choose the larger B1200 to prevent vignetting (darkening at the corners of your image) due to the extra back focus required by a camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a larger blocking filter like the B1200 recommended for imaging with my 80mm f\/7 refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAn 80mm f\/7 refractor has a 560mm focal length. While the B600 is suitable for visual use at this focal length, imaging setups require more back focus. This means your camera sensor sits farther back from the telescope than an eyepiece, intersecting a wider part of the light cone. The larger aperture of a B1200 ensures this wider cone passes through to the sensor without being clipped, preserving brightness across the entire field.\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 diagonal and straight-through versions of the Lunt B600?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe choice depends on your application:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStar Diagonal (1.25\" or 2\"):\u003c\/strong\u003e This is the standard choice for visual observing, as it places the eyepiece at a comfortable 90-degree angle.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eStraight-Through (2\"):\u003c\/strong\u003e This version is preferred for imaging, as it provides a direct light path to the camera sensor with fewer optical surfaces and potential for flexure.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt B600 come with T2 threads?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, all available housing options for the Lunt B600 blocking filter—the 1.25\" diagonal, 2\" diagonal, and 2\" straight-through tube—come equipped with a male T2 thread connection. This allows for a secure, threaded attachment to most standard astronomy cameras and T-rings.\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\u003eB400\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBlocking Filter Aperture\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Housings\u003c\/td\u003e\n\u003ctd\u003e1.25\" Star Diagonal, 2\" Star Diagonal, 2\" Straight-Through Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eT2 Thread (on all housing options)\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 B600 Blocking Filter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e(Housing as selected)\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":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967533740317,"sku":"LSS-B600s","price":553.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" in Star diagonal with T2 connection","offer_id":44967533773085,"sku":"LSS-B600d1","price":553.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in Star diagonal with T2 connection","offer_id":44967533805853,"sku":"LSS-B600d2","price":553.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Blocking-Filter-Diagonal-Straight-Through__18551.1598239592.1280.1280.jpg?v=1684343598"},{"product_id":"lunt-b1200-blocking-filter","title":"Lunt B1200 Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e12mm Blocking Filter Aperture\u003c\/li\u003e\n\u003cli\u003eRequired safety component for all Lunt H-alpha Etalon systems\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" or 2\" diagonal housings\u003c\/li\u003e\n\u003cli\u003eAvailable in a 2\" straight-through housing for imaging\u003c\/li\u003e\n\u003cli\u003eIncludes T2 threads for secure camera connection\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 B1200 Blocking Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt B1200 Blocking Filter integrates a 12mm aperture with essential, non-removable safety filters, making it a mandatory component for any Lunt H-alpha solar telescope or Etalon filter system. Available in 1.25\" or 2\" diagonal housings for visual comfort, as well as a 2\" straight-through option for imaging, the B1200 is designed to prevent vignetting in telescopes with moderate to long focal lengths. This 12mm filter size ensures the entire solar disc is illuminated at the focal plane and is the recommended minimum for most imaging applications.\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 12mm Blocking Filter's Role in a Lunt H-alpha System\u003c\/h3\u003e\n\u003cp\u003eA Lunt blocking filter is not an optional accessory; it is an integral part of the solar filtering system that is absolutely required for safe observation. The B1200's housing contains a unique, multi-filter stack that works in conjunction with the front-mounted Etalon to reject harmful radiation and isolate the H-alpha wavelength. Lunt Solar Systems can only warranty the safety and optical performance of their systems when a Lunt Etalon is paired with a matching Lunt blocking filter.\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\u003eSizing and Application: Why a 12mm Aperture is Critical for Imaging\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct blocking filter is determined by your telescope's focal length and your intended application. The 12mm aperture of the B1200 is sized to fully illuminate the field in telescopes with longer focal lengths, preventing the edge of the solar disk from being cut off. For imagers, the B1200 is often the necessary choice even on shorter scopes, as imaging trains require additional back focus. This moves the filter further from the focal plane, where the light cone is wider, demanding the larger 12mm aperture to avoid vignetting your camera sensor.\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 Between 1.25\" Diagonal, 2\" Diagonal, or 2\" Straight-Through Housings\u003c\/h3\u003e\n\u003cp\u003eThe Lunt B1200 is available in three distinct housings to match your equipment and observing style, with all versions including an integrated T2 thread for direct camera attachment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal Housings (1.25\" or 2\"):\u003c\/strong\u003e These are the standard choice for visual observing, placing the eyepiece at a comfortable 90-degree angle. Choose the barrel size that matches your eyepieces and focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStraight-Through Housing (2\"):\u003c\/strong\u003e This configuration is purpose-built for astro-imaging. It provides a direct, non-deflected light path to the camera sensor, which is critical for minimizing tilt and ensuring the sharpest possible image across the entire field.\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\"\u003eWhy is the Lunt B1200 Blocking Filter required for my Lunt Etalon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt B1200 is a critical safety component. It contains secondary filters that work with the main Etalon to block harmful UV and IR radiation, making solar observation safe. Its use is mandatory for the proper and safe functioning of any Lunt H-alpha system, and is required for warranty coverage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I choose the Lunt B1200 or a smaller blocking filter like the B600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on your telescope's focal length and whether you plan to do visual observing or imaging. The \u003cstrong\u003eLunt B1200\u003c\/strong\u003e is designed for telescopes with longer focal lengths to prevent the edges of the Sun's disc from being cut off. It is also the recommended starting point for imaging, as camera sensors require more back focus, which in turn requires a larger blocking filter aperture to avoid vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to image the Sun with my 1200mm focal length refractor. Is the Lunt B1200 correct?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Lunt B1200 is an excellent choice for a telescope with a 1200mm focal length, especially for imaging. The 12mm aperture is large enough to accommodate the wider light cone associated with both the long focal length and the increased back focus needed for a camera, ensuring your sensor is fully illuminated.\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 diagonal and straight-through versions of the Lunt B1200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003ediagonal housings (1.25\" and 2\")\u003c\/strong\u003e are primarily for visual use, providing a comfortable 90-degree viewing angle. The \u003cstrong\u003e2\" straight-through housing\u003c\/strong\u003e is designed for imaging, as it provides a direct light path to the camera sensor, which helps to eliminate potential optical tilt and ensures the highest image fidelity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B1200 to see a full-disc view of the Sun in my Lunt LS80THa telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Lunt B1200's 12mm aperture is more than sufficient to provide a complete, unvignetted view of the entire solar disc when used visually with a Lunt LS80THa or other telescopes with similar focal lengths. It provides a generous field of view for framing the Sun and surrounding prominences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo all versions of the Lunt B1200 Blocking Filter have a T2 thread for my astronomy camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, all available housing options for the Lunt B1200—the 1.25\" diagonal, 2\" diagonal, and 2\" straight-through tube—come standard with a T2 connection. This allows you to securely thread your camera directly to the blocking filter for 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\u003eB400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Housings\u003c\/td\u003e\n\u003ctd\u003e2\" Straight-Through Tube, 1.25\" Star Diagonal, 2\" Star Diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eT2 Thread (on all housing options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece\/Focuser Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" or 2\" (depending on housing option)\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 B1200 Blocking Filter Assembly\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":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967533904157,"sku":"LSS-B1200s","price":693.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" in star diagonal with T2 connection","offer_id":44967533936925,"sku":"LSS-B1200d1","price":693.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in star diagonal with T2 connection","offer_id":44967533969693,"sku":"LSS-B1200d2","price":693.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Blocking-Filter-Diagonal-Straight-Through__52595.1598239665.1280.1280.jpg?v=1684343605"},{"product_id":"lunt-b1800-blocking-filter","title":"Lunt B1800 Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eRequired safety component for all Lunt Solar Systems H-alpha etalons\u003c\/li\u003e\n\u003cli\u003eSized for longer focal length telescopes to prevent vignetting\u003c\/li\u003e\n\u003cli\u003eAvailable in 1.25\" and 2\" star diagonal housings for visual comfort\u003c\/li\u003e\n\u003cli\u003eAvailable in a 2\" straight-through housing for imaging applications\u003c\/li\u003e\n\u003cli\u003eFeatures integrated T2 threads for secure camera attachment on all models\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 B1800 Blocking Filter\u003c\/h2\u003e\n\u003cp\u003eAvailable in 1.25\" and 2\" formats, the Lunt B1800 Blocking Filter is a critical safety component for all Lunt H-alpha etalon systems and is specifically sized to prevent vignetting in telescopes with longer focal lengths. The B1800 is offered in multiple housings, including a 2\" straight-through tube and both 1.25\" and 2\" star diagonals, all of which incorporate a T2 thread for secure camera connections.\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 Lunt B1800: A Critical Safety Component in 1.25\" and 2\" Formats\u003c\/h3\u003e\n\u003cp\u003eA Lunt blocking filter is not an optional accessory; it is an essential part of the complete solar telescope system. The housing contains additional, specialized filters that work in conjunction with the main etalon to reject harmful radiation and provide a safe, high-contrast view of the Sun's chromosphere. Lunt Solar Systems can only warranty the safety and optical performance of their H-alpha systems when used with a matching Lunt blocking filter.\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\u003eSizing the B1800: Matching Filter Aperture to Telescope Focal Length\u003c\/h3\u003e\n\u003cp\u003eThe \"B1800\" designation indicates this blocking filter is designed for telescopes with longer focal lengths. As a telescope's focal length increases, the light cone it produces becomes longer and narrower, requiring a larger blocking filter aperture at the focal plane to intercept the entire field of view without vignetting. The B1800 ensures that the full solar disk remains illuminated, which is crucial for both visual observation and imaging.\u003c\/p\u003e\n\u003cp\u003eFor imaging, it is recommended to choose a larger blocking filter than required for visual use with the same telescope. The added back focus of a camera setup moves the sensor further down the optical path, where the light cone is wider. The B1800 provides the necessary aperture to accommodate this wider cone, preventing the edges of your images from being clipped or darkened.\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\u003eHousing \u0026amp; Connectivity: T2 Threads on All 3 B1800 Configurations\u003c\/h3\u003e\n\u003cp\u003eThe Lunt B1800 is available in three distinct configurations to match your equipment and observing style. Your choice of housing does not affect the filter's performance but determines its physical connection to your telescope and eyepieces.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiagonal Housings (1.25\" or 2\"):\u003c\/strong\u003e These are the standard choice for visual observing, providing a comfortable 90-degree viewing angle. The choice between a 1.25\" and 2\" model depends on your focuser and eyepiece collection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStraight-Through Housing (2\"):\u003c\/strong\u003e This version is optimized for astrophotography. It provides a direct, rigid optical path to the camera sensor, minimizing potential flexure and making it easier to achieve perfect focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT2 Threads:\u003c\/strong\u003e All three versions come standard with male T2 (M42x0.75) threads, allowing you to connect most dedicated astronomy cameras directly and securely to the blocking filter.\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\"\u003eWhy is the Lunt B1800 Blocking Filter required for my Lunt solar telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt B1800 is a mandatory safety component. It contains a set of secondary filters that work with your main etalon to remove harmful out-of-band radiation, making it safe to view the Sun. It is not just a simple diagonal or adapter; it is an integral part of the telescope's filtering system, and Lunt only warranties safety and performance when their etalons and blocking filters are used together.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if the Lunt B1800 is the right size for my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe correct blocking filter size is determined by your telescope's focal length. The \u003cstrong\u003eLunt B1800\u003c\/strong\u003e is designed for telescopes with longer focal lengths. Using a filter that is too small for your telescope's focal length will result in vignetting, where the edges of the Sun's disk are cut off. If you plan to image, it's always recommended to select the next larger blocking filter than what is suggested for visual use alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eShould I get the diagonal or straight-through version of the Lunt B1800 Blocking Filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the housing based on your primary use. For \u003cstrong\u003evisual observing\u003c\/strong\u003e, a diagonal housing (either 1.25\" or 2\") provides a much more comfortable viewing angle. For \u003cstrong\u003eastrophotography\u003c\/strong\u003e, the 2\" straight-through housing provides the most rigid and direct connection for your camera, which helps prevent flexure and maintain focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to image the Sun with my 1200mm refractor. Is the Lunt B1800 a better choice than the B1200?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for imaging, the Lunt B1800 is the superior choice for a 1200mm focal length telescope. While a B1200 would work for visual use, imaging systems require more back focus. This moves the camera sensor further from the focal plane, intersecting a wider part of the light cone. The larger aperture of the B1800 is necessary to illuminate the entire camera sensor without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B1800 Blocking Filter for visual observing in my 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Lunt B1800 is an excellent match for a typical 8\" Schmidt-Cassegrain Telescope (SCT). These telescopes usually have a focal length around 2000mm, which requires a larger blocking filter like the B1800 to fully illuminate the field of view for visual observation of solar prominences and surface detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the T2 thread on the Lunt B1800 Blocking Filter for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe T2 (M42x0.75) thread is an industry standard for astrophotography. It allows you to attach a dedicated astronomy camera, DSLR with a T-ring, or other imaging accessories directly to the Lunt B1800 Blocking Filter. This creates a secure, threaded connection that is far more stable than using a simple set screw in an eyepiece holder.\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\u003eB400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003e2\" in Straight Thru 2\" tube with T2 \u0026amp; 2\" connection, 1.25\" in star diagonal with T2 connection, 2\" in star diagonal with T2 connection\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":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967534002461,"sku":"LSS-B1800s","price":1113.0,"currency_code":"CAD","in_stock":true},{"title":"1.25\" in star diagonal with T2 connection","offer_id":44967534035229,"sku":"LSS-B1800d1","price":1113.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in star diagonal with T2 connection","offer_id":44967534067997,"sku":"LSS-B1800d2","price":1113.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Blocking-Filter-Diagonal-Straight-Through__59879.1598239736.1280.1280.jpg?v=1684343569"},{"product_id":"lunt-b3400-blocking-filter","title":"Lunt B3400 Blocking filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e34mm Blocking Filter Aperture\u003c\/li\u003e\n\u003cli\u003eRequired safety component for all Lunt Solar Telescopes\u003c\/li\u003e\n\u003cli\u003eOptimized for visual use up to 3400mm focal length\u003c\/li\u003e\n\u003cli\u003eRecommended for imaging use up to 1800mm focal length\u003c\/li\u003e\n\u003cli\u003e2-inch straight-through housing with T2 and 2-inch connections\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\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 B3400 Blocking Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt B3400 Blocking Filter is a non-negotiable safety and component for long focal length solar observation, providing a clear 34mm aperture housed in a 2-inch straight-through body. This filter is specifically engineered to prevent vignetting in telescopes with focal lengths up to 3400mm for visual use and 1800mm for imaging. Its integrated 2-inch and T2 connections ensure direct compatibility with a wide range of eyepieces and cameras, making it the correct choice for large refractors and Schmidt-Cassegrains dedicated to H-alpha solar work.\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 34mm Blocking Filter: A Mandatory Safety System\u003c\/h3\u003e\n\u003cp\u003eA Lunt blocking filter is not an optional accessory; it is a required component for the safe operation of any Lunt H-alpha solar telescope or filter. The B3400 contains a multi-layer filter system that rejects harmful out-of-band radiation, working in tandem with the primary etalon to isolate the 656nm H-alpha line. Lunt's safety and warranty are contingent on using their integrated system, as the blocking filter is the final, critical stage in delivering a safe and high-contrast view 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\u003e3400mm for Visual, 1800mm for Imaging: Preventing Vignetting\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the large 34mm aperture in the B3400 is to fully illuminate the field of view in long focal length instruments. For visual observation with wide-field, low-power eyepieces, it supports telescopes up to 3400mm, ensuring the edges of the view remain bright. For imaging, where camera sensors are typically smaller than an eyepiece's field stop, the recommended maximum focal length is 1800mm to guarantee an unvignetted, evenly illuminated sensor.\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\u003e2-inch Straight-Through Housing with T2 Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe B3400 is built into a robust 2-inch straight-through extension tube, designed for straightforward integration into your optical train. This housing provides two standard connection points for maximum flexibility.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch Barrel:\u003c\/strong\u003e Allows you to directly insert 2-inch eyepieces or other 2-inch accessories for visual observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT2 Male Threads:\u003c\/strong\u003e Provides a rigid, threaded connection (M42x0.75) for attaching DSLR T-rings or dedicated astronomy cameras, minimizing tilt and ensuring a secure imaging setup.\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\u003eLunt B3400 vs. B1800: Matching the Filter to Your Telescope\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct blocking filter is critical for field illumination. The decision between the B3400 and smaller models like the B1800 depends entirely on your telescope's focal length.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunt B1800 Advantage:\u003c\/strong\u003e The B1800 is the correct choice for telescopes with focal lengths up to 1800mm for visual use. It is more affordable and perfectly suited for a wide range of mid-sized refractors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunt B3400 Advantage:\u003c\/strong\u003e The B3400 is purpose-built for longer instruments. If you use a telescope with a focal length between 1800mm and 3400mm, the B3400 is required to avoid significant vignetting (dimming at the edge of the field) that the B1800 would cause.\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\"\u003eWhy is the Lunt B3400 blocking filter a required component?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt B3400 is an essential safety device. While the main H-alpha etalon filters the light, the blocking filter contains additional filtering to reject all other harmful wavelengths of light from reaching your eye or camera. It is a mandatory part of the Lunt solar filter system, and performance and safety are only warrantied when a Lunt blocking filter is used with a Lunt H-alpha filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat happens if I use the Lunt B3400 on a telescope with a 4000mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eEven though the B3400 is Lunt's largest blocking filter, using it on a telescope with a focal length significantly beyond its 3400mm visual rating will result in \u003cstrong\u003evignetting\u003c\/strong\u003e. The light cone from the primary mirror will be too large for the filter's 34mm aperture to pass entirely, causing the edges of your field of view to appear dim or completely dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B3400 to image the Sun with my 10\" f\/10 SCT (2500mm focal length)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is not recommended. The Lunt B3400 is rated for imaging on telescopes with focal lengths up to 1800mm. On a 2500mm system, you would experience significant vignetting on all but the very smallest imaging sensors. To use your SCT for H-alpha imaging, you would need to use a focal reducer to bring the effective focal length down to 1800mm or less.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main difference between the Lunt B3400 and the B1800 blocking filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe only functional difference is the focal length they support. The \u003cstrong\u003eB1800\u003c\/strong\u003e is for telescopes up to 1800mm (visual), while the \u003cstrong\u003eB3400\u003c\/strong\u003e is required for telescopes with focal lengths between 1800mm and 3400mm. Using a filter that is too small for your telescope's focal length will cause the view to be cut off at the edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the T2 threads on the Lunt B3400 blocking filter used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe male T2 (M42x0.75) threads provide a secure, direct attachment point for imaging equipment. You can connect a DSLR camera using a brand-specific T-ring or attach a dedicated astronomy camera that has female T2 threads, creating a rigid connection that prevents camera sag or tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B3400 with a solar etalon from another brand?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Lunt Solar Systems explicitly states that their blocking filters are part of an integrated system. Safety and performance can only be warrantied when a Lunt blocking filter is paired with a Lunt H-alpha filter or telescope. Mixing and matching components from different manufacturers is unsafe and not supported.\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\u003eB3400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e34mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Diameter\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Connection\u003c\/td\u003e\n\u003ctd\u003e2-inch Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Connections\u003c\/td\u003e\n\u003ctd\u003e2-inch Eyepiece Holder, T2 (M42x0.75) Male Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Visual Focal Length\u003c\/td\u003e\n\u003ctd\u003e3400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Imaging Focal Length\u003c\/td\u003e\n\u003ctd\u003e1800mm\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\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":44967534166301,"sku":"LSS-B3400s2","price":3493.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-B3400-Blocking-Filter-1__43395.1598240039.1280.1280.jpg?v=1684343575"},{"product_id":"lunt-b600-calcium-k-blocking-filter","title":"Lunt B600 Calcium K Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 393.4 nm Calcium-K (Ca-K) emission line\u003c\/li\u003e\n\u003cli\u003e6mm internal blocking filter aperture\u003c\/li\u003e\n\u003cli\u003eNarrow \u0026lt;2.4 Angstrom bandpass for high-contrast views\u003c\/li\u003e\n\u003cli\u003eAvailable in 2-inch diagonal or straight-through housings\u003c\/li\u003e\n\u003cli\u003eOptimized primarily for solar imaging\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 B600 Calcium K Blocking Filter\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt B600 Calcium K Blocking Filter is an imaging module designed to isolate the 393.4 nm emission line with a 6mm internal blocking filter. With a narrow \u0026lt;2.4 Angstrom bandpass, this 2-inch module reveals the intricate, high-contrast details of the Sun's lower chromosphere—a layer of solar activity just below what is visible in Hydrogen-alpha.\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 393.4 nm Calcium-K Line: A Deeper Look at Solar Activity\u003c\/h3\u003e\n      \u003cp\u003eThis filter targets the Calcium-K (Ca-K) line at 393.4 nm, an emission from ionized calcium at the edge of the visible spectrum. This reveals a cooler, lower layer of the chromosphere than H-alpha, showing areas of super-granulation cells that are brightest in regions of intense magnetic fields. By studying the sun in both Ca-K and H-alpha, you gain crucial insights into the structure, strength, and depth of active regions and sunspots.\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 \u0026lt;2.4 Angstrom Bandpass Optimized for Cameras\u003c\/h3\u003e\n      \u003cp\u003eWith a bandpass of less than 2.4 Angstroms, the Lunt B600 delivers the high contrast needed to resolve fine chromospheric details. Because the 393.4 nm wavelength sits in the deep violet\/UV part of the spectrum, it can be difficult for the human eye to perceive fully, as the cornea naturally yellows with age. For this reason, the Ca-K line is best studied with monochrome cameras, which are highly sensitive at this wavelength and can capture stunningly detailed images of the solar surface.\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\u003e2-inch Diagonal or Straight-Through Housings for Refractors\u003c\/h3\u003e\n      \u003cp\u003eThe Lunt B600 Ca-K module is designed for versatility and can be integrated with most standard nighttime refractors or Lunt's Modular Telescopes. It is available in two 2-inch housings to suit your imaging train: a 2-inch star diagonal for a comfortable equipment angle, or a 2-inch straight-through tube for direct optical paths. Both versions include a T2 thread for secure camera attachment, with the straight-through model also offering a standard 2-inch eyepiece\/accessory holder.\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\"\u003eWhy is the Lunt B600 Ca-K filter primarily for imaging?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe filter isolates light at \u003cstrong\u003e393.4 nm\u003c\/strong\u003e, which is a deep violet color at the edge of the human visible spectrum. Many people, especially as they get older, have difficulty perceiving contrast at this wavelength due to natural yellowing of the eye's cornea. Cameras, particularly monochrome CMOS\/CCD sensors, are very sensitive to this wavelength and can record far more detail than is typically visible by eye.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat will I see with the Lunt B600 Ca-K filter that I can't see in H-alpha?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Lunt B600 Ca-K filter shows a different, slightly lower and cooler layer of the Sun's chromosphere. Key features visible in Ca-K include:\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSupergranulation:\u003c\/strong\u003e A network of large-scale convection cells across the solar surface.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePlage:\u003c\/strong\u003e Bright regions around sunspots that indicate high magnetic activity, which appear with higher contrast in Ca-K.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSunspot Structure:\u003c\/strong\u003e Details in the magnetic regions preceding and surrounding sunspots.\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 the Lunt B600 Ca-K module with my existing non-Lunt refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, the Lunt B600 Ca-K module is designed to work with most standard nighttime refractors. You simply insert the 2-inch blocking filter diagonal or straight-through tube into your focuser. No other filters are required on the front of the telescope.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Lunt B600 Ca-K filter reveal details in a complex sunspot group like AR3664?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor a large active region like AR3664, the Lunt B600 Ca-K filter would excel at highlighting the bright, magnetically active plage surrounding the dark sunspot umbrae. It would clearly define the boundaries of the magnetic activity and show the underlying supergranulation network, providing a more complete picture of the region's structure than a white-light or H-alpha view alone.\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 diagonal and straight-through versions of the Lunt B600 Ca-K filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eBoth versions contain the same 6mm Ca-K blocking filter. The choice depends on your setup preference:\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003eThe \u003cstrong\u003e2\" Star Diagonal\u003c\/strong\u003e version provides a 90-degree angle, which can be more convenient for positioning equipment and avoiding clearance issues on some mounts.\u003c\/li\u003e\n        \u003cli\u003eThe \u003cstrong\u003e2\" Straight-Through\u003c\/strong\u003e version keeps your camera and accessories directly in the optical path, which some imagers prefer for simplicity. It also includes both T2 threads and a 2\" eyepiece holder.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have an 80mm f\/7 refractor; which camera type works best with the Lunt B600 Ca-K filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eFor an 80mm refractor, a \u003cstrong\u003emonochrome CMOS planetary camera\u003c\/strong\u003e with small pixels (around 2.9 to 3.75 microns) would be an excellent match for the Lunt B600 Ca-K filter. The monochrome sensor provides the necessary sensitivity at the 393.4 nm wavelength, and the small pixels will provide high-resolution sampling of the solar details delivered by your telescope.\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\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e393.4 nm (Calcium-K)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;2.4 Angstroms\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBlocking Filter Aperture\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eHousing Format\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Housings\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal or 2\" Straight-Through Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003eT2 and\/or 2\" depending on housing choice\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS6CaKMD\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eLS12CaKMD\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 B600 Calcium K Blocking Filter Module (in selected housing)\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":"2\" in Star diagonal with T2 connection","offer_id":44967534199069,"sku":"LSS-LS6CaKMDd","price":1253.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967534231837,"sku":"LSS-LS6CaKMDs","price":1253.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Calcium-K-B1800-Diagonal-Straight-Through__72906.1598206201.1280.1280.jpg?v=1684343582"},{"product_id":"lunt-b1200-cak-blocking-filter","title":"Lunt B1200 CaK Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReveals solar details in the 393.4 nm Calcium-K line\u003c\/li\u003e\n\u003cli\u003eInternal narrowband filter with a \u0026lt;2.4 Angstrom bandpass\u003c\/li\u003e\n\u003cli\u003eFeatures a 12mm blocking filter\u003c\/li\u003e\n\u003cli\u003eDesigned primarily for solar imaging\u003c\/li\u003e\n\u003cli\u003eAvailable in a 2\" diagonal or 2\" straight-thru housing\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 B1200 CaK Blocking Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt B1200 CaK Blocking Filter module isolates the 393.4 nm Calcium K emission line, revealing a cooler, lower layer of the Sun's chromosphere than H-alpha viewing. With a narrow \u0026lt;2.4 Angstrom bandpass, this 12mm blocking filter is engineered to transform a standard nighttime refractor into a dedicated solar instrument for high-contrast imaging of supergranulation cells and 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\u003eImaging Solar Structure at 393.4 nm\u003c\/h3\u003e\n\u003cp\u003eThe Calcium K wavelength at 393.4 nm provides a unique view of solar magnetic activity. This emission line highlights areas of supergranulation, which appear brightest and most defined in regions of high magnetic flux, such as those surrounding sunspots. By studying the Sun in both Ca-K and H-alpha, you gain crucial insights into the structure, strength, and depth of these active regions, creating a more complete picture of solar dynamics.\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\u003e\u0026lt;2.4 Angstrom Bandpass for High-Contrast Imaging\u003c\/h3\u003e\n\u003cp\u003eThis filter module is primarily an imaging system due to the nature of the Ca-K wavelength. Positioned at the edge of the visible spectrum in the deep violet, many observers cannot easily perceive its contrast due to the natural yellowing of the human cornea over time. Cameras, however, are highly sensitive at 393.4 nm and can record stunning detail. The filter's \u0026lt;2.4 Angstrom bandpass ensures that only this specific wavelength reaches your sensor, rejecting other light to maximize the contrast of faint chromospheric features.\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 12mm B1200 Module and Your Telescope\u003c\/h3\u003e\n\u003cp\u003eLunt's B1200 Ca-K module is designed for versatility, allowing you to convert most standard nighttime refractors or a Lunt Modular Telescope into a specialized solar scope. The 12mm blocking filter provides a generous field for imaging with a wide range of telescopes and cameras. You can select the housing that best fits your workflow: a 2\" star diagonal for a more comfortable imaging angle, or a 2\" straight-thru tube for a direct optical path. Both housings feature a T2 thread for secure camera attachment.\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 B1200 CaK filter recommended for imaging over visual use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Calcium K line is at \u003cstrong\u003e393.4 nm\u003c\/strong\u003e, a deep violet color at the edge of the visible spectrum. Many people have difficulty seeing fine details at this wavelength due to natural aging of the eye. Cameras are far more sensitive to this light, allowing them to capture high-contrast details like supergranulation that are often invisible to the eye.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat solar features does the Lunt B1200 CaK filter show that H-alpha filters do not?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt B1200 CaK filter shows a \u003cstrong\u003edifferent, lower, and cooler layer of the chromosphere\u003c\/strong\u003e. It excels at revealing the \"cobblestone\" pattern of \u003cstrong\u003esupergranulation cells\u003c\/strong\u003e across the solar surface, which are particularly bright and defined around sunspots and active regions. H-alpha, in contrast, is better for viewing prominences, filaments, and details in the upper chromosphere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt B1200 CaK module with my 100mm f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Lunt B1200 CaK module is designed to work with most standard nighttime refractors. A 100mm f\/7 refractor is an excellent choice for this filter, providing enough aperture to resolve fine details within the Ca-K line. The 12mm blocking filter is well-matched to the focal length, ensuring the full solar disk is illuminated on your camera sensor.\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 diagonal and straight-thru versions of the B1200 CaK filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe choice depends on your ergonomic preference and imaging setup.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cstrong\u003e2\" star diagonal\u003c\/strong\u003e version places your camera at a 90-degree angle, which can be more comfortable and may help with clearance issues on certain mounts.\u003c\/li\u003e\n\u003cli\u003eThe \u003cstrong\u003e2\" straight-thru tube\u003c\/strong\u003e version keeps the camera directly in line with the telescope, providing a straight optical path which some imagers prefer for simplicity and alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\nBoth versions contain the same B1200 CaK filter and offer a T2 thread for camera connection.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see more detail with the Lunt B1200 CaK if I've had cataract surgery?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is often reported that individuals who have had cataract surgery can see significantly more detail in the Ca-K line. The surgery replaces the eye's natural lens, which may have yellowed with age, with a clear artificial lens that transmits more of the violet 393.4 nm light. However, even with this advantage, imaging is still the recommended method for capturing the full range of detail.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt B1200 CaK filter help in studying a complex sunspot region?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile white light filters show the dark umbra of a sunspot, the Lunt B1200 CaK filter reveals the associated magnetic activity in the chromosphere above it. You will be able to image the bright, magnetically-contained plasma (plage) surrounding the sunspot, providing context and showing the extent of the active region that is invisible in white light or even H-alpha.\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\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e393.4 nm (Calcium K)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;2.4 Angstroms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter Aperture\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Options\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal or 2\" Straight-Thru Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eT2 Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS6CaKMD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eLS12CaKMD\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\"\u003eB1200 CaK Blocking Filter Module\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003ein selected housing (Star Diagonal or Straight-Thru Tube)\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":"2\" in Star diagonal with T2 connection","offer_id":44967534330141,"sku":"LSS-LS12CaKMDd","price":2093.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967534362909,"sku":"LSS-LS12CaKMDs","price":2093.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Calcium-K-B1800-Diagonal-Straight-Through__79606.1598232122.1280.1280.jpg?v=1684343590"},{"product_id":"lunt-b1800-calcium-k-blocking-filter","title":"Lunt B1800 Calcium K Blocking Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eIsolates the 393.4 nm Calcium K emission line\u003c\/li\u003e\n\u003cli\u003eBandpass of less than 2.4 Angstroms for high-contrast views\u003c\/li\u003e\n\u003cli\u003e18mm clear aperture blocking filter\u003c\/li\u003e\n\u003cli\u003eFits standard 2-inch focusers with T2 camera threads\u003c\/li\u003e\n\u003cli\u003eConverts a standard nighttime refractor for solar imaging\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 B1800 Calcium K Blocking Filter\u003c\/h2\u003e\n\u003cp\u003eThe Lunt B1800 Calcium K Blocking Filter isolates the 393.4 nm emission line with a narrow sub-2.4 Angstrom bandpass, revealing a dynamic layer of the Sun's chromosphere often missed by other filters. This 18mm blocking filter module is designed as a dedicated imaging system, fitting into a standard 2-inch focuser to convert your nighttime refractor into a specialized solar instrument for studying solar magnetism.\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 Calcium K Line: Imaging Solar Magnetism at 393.4 nm\u003c\/h3\u003e\n\u003cp\u003eThis filter is precisely centered on the Calcium K (Ca-K) line at 393.4 nm, a wavelength produced by calcium ions just at the violet edge of the visible spectrum. This emission reveals a layer of the chromosphere that is slightly lower and cooler than what is seen in Hydrogen-alpha, providing a complementary view of solar activity. Ca-K imaging excels at showing super granulation cells and is particularly sensitive to areas of high magnetic fields, making sunspots and surrounding active regions appear with dramatic brightness and structure.\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 Sub-2.4 Angstrom Bandpass for High-Contrast Chromosphere Imaging\u003c\/h3\u003e\n\u003cp\u003eTo isolate the faint details within the Ca-K line, the Lunt B1800 employs an internal narrowband filter with a bandpass of less than 2.4 Angstroms. This tight specification is critical for rejecting overwhelming continuum light from the photosphere, allowing the faint chromospheric network and plage to stand out with sharp contrast. The result is a dark, clean background against which the brightest, most magnetically active solar features are rendered in stunning detail by your camera.\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\u003eOptimized for 393.4 nm Imaging: Why Ca-K Favors the Camera Sensor\u003c\/h3\u003e\n\u003cp\u003eThe 393.4 nm Ca-K wavelength is notoriously difficult for the human eye to perceive with high contrast. As we age, the cornea naturally yellows, filtering out the deep violet light where Ca-K resides. For this reason, the B1800 is primarily an imaging system, as modern camera sensors are highly sensitive to this wavelength and can capture incredible detail that is visually inaccessible to most observers. While some individuals, particularly those who have had cataract surgery, may see more detail, the most rewarding results from this filter will come from photography.\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\u003eFlexible Integration: 2-inch and T2 Connections for Standard Refractors\u003c\/h3\u003e\n\u003cp\u003eDesigned for versatility, the Lunt B1800 Ca-K module can convert most standard nighttime refractors into a capable Ca-K solar telescope. It is available in housings that slide into any 2-inch focuser and provide industry-standard T2 (M42x0.75) threads for direct, secure attachment of most astronomy cameras. This ensures a solid imaging train, whether you choose the straight-through or star diagonal configuration, allowing you to focus on capturing the dynamic solar surface.\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\"\u003eCan I use the Lunt B1800 Ca-K filter for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt B1800 Ca-K filter is designed primarily as an \u003cstrong\u003eimaging system\u003c\/strong\u003e. The 393.4 nm wavelength is deep in the violet part of the spectrum, where most people have very low visual contrast sensitivity. While you may see a violet disk, the fine details like super granulation are best captured with a camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of telescope do I need for the Lunt B1800 Ca-K filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter module is designed to work with most standard \u003cstrong\u003enighttime refractor telescopes\u003c\/strong\u003e. It can also be used with Lunt's Modular Telescopes when they are configured for nighttime use. It is not a standalone filter and requires a telescope to function.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the view in Calcium K with the Lunt B1800 differ from Hydrogen-alpha?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCalcium K shows a lower, cooler layer of the chromosphere than Hydrogen-alpha. While H-alpha is excellent for prominences and surface filaments, Ca-K excels at highlighting areas of strong magnetic fields. This makes \u003cstrong\u003esunspots and their surrounding active regions (plage)\u003c\/strong\u003e appear as intensely bright areas, offering a different and complementary perspective on solar activity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat specific solar features will the Lunt B1800 Ca-K filter show on an active Sun?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDuring periods of high solar activity, the Lunt B1800 Ca-K filter will reveal a wealth of detail. You can expect to image:\u003cbr\u003e\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright Plage:\u003c\/strong\u003e The bright, complex regions surrounding sunspot groups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSunspots:\u003c\/strong\u003e Displayed with high contrast against the surrounding plage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupergranulation Network:\u003c\/strong\u003e The large-scale convection cell pattern across the solar disk.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt B1800 Ca-K filter work with my 100mm f\/7 refractor for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a 100mm f\/7 refractor is an excellent choice for use with the Lunt B1800 Ca-K filter. The 18mm blocking filter provides full-disk illumination for telescopes with focal lengths up to 1800mm, so your 700mm focal length scope is well within the ideal range for capturing the entire Sun in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Lunt B1800 Ca-K filter's bandpass \u0026lt;2.4 Angstroms?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe sub-2.4 Angstrom bandpass is essential for achieving high contrast. The Sun's photosphere is incredibly bright, and this light would wash out the faint details of the chromosphere. The narrow bandpass blocks this unwanted light, allowing only the specific \u003cstrong\u003e393.4 nm Ca-K wavelength\u003c\/strong\u003e to reach the camera sensor, dramatically improving image contrast.\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\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e393.4 nm (Calcium K)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;2.4 Angstroms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking Filter Aperture\u003c\/td\u003e\n\u003ctd\u003e18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Options\u003c\/td\u003e\n\u003ctd\u003e2\" Star Diagonal or 2\" Straight-Through Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eT2 (M42x0.75) Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eRefractor Telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eLS12CaKMD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS6CaKMD\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":"2\" in Star diagonal with T2 connection","offer_id":44967534428445,"sku":"LSS-LS18CaKMDd","price":2373.0,"currency_code":"CAD","in_stock":true},{"title":"2\" in Straight Thru 2\" tube with T2 \u0026 2\" connection","offer_id":44967534461213,"sku":"LSS-LS18CaKMDs","price":2373.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Calcium-K-B1800-Diagonal-Straight-Through__09195.1598232050.1280.1280.jpg?v=1684343597"},{"product_id":"lunt-herschel-wedge-2","title":"Lunt Herschel Wedge - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFor White Light Solar Observing\u003c\/li\u003e\n\u003cli\u003eProvides Superior Image Contrast and Sharpness\u003c\/li\u003e\n\u003cli\u003eIntegrated Neutral Density Filter for Safe Imaging\u003c\/li\u003e\n\u003cli\u003eDesigned for Refractors with up to 6\" of Aperture\u003c\/li\u003e\n\u003cli\u003e2\" Barrel and Eyepiece Holder\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 Herschel Wedge - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Lunt 2\" Herschel Wedge is engineered for uncompromising white light solar observation, delivering superior contrast for viewing and imaging the sun's photosphere. It is designed for use in refractor telescopes up to 6\" in aperture and includes an integrated ND3 filter for safe, direct-to-camera solar imaging. This 2\" diagonal provides a high-fidelity alternative to front-mounted solar films or glass filters, revealing finer details in sunspots and granulation.\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 Highest-Contrast Views of the Solar Photosphere\u003c\/h3\u003e\n\u003cp\u003eA Herschel wedge, or solar diagonal, provides the sharpest and highest-contrast views of the sun's surface possible in white light. Unlike traditional filters that fit over the front of your telescope, the wedge uses a precision prism to reject most of the sun's energy, passing only a small, safe fraction to the eyepiece. This method minimizes internal reflections and scattered light, resulting in a darker sky background and resolving finer details in sunspot umbra, penumbra, and solar granulation.\u003c\/p\u003e\n\u003cp\u003eThe Lunt 2\" Herschel Wedge includes a factory-installed ND3 filter, which provides the necessary light reduction for safe use with imaging cameras. For visual observation, an additional polarizing filter (sold separately) is recommended; threading one onto your eyepiece allows you to rotate the eyepiece to adjust the view to a comfortable brightness.\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\u003eEngineered for Refractors up to 6\" in Aperture\u003c\/h3\u003e\n\u003cp\u003eThis solar diagonal is designed exclusively for use with refractor telescopes, as reflecting telescopes (like Newtonians or SCTs) have a secondary mirror that can be damaged by the concentrated solar energy. The Lunt 2\" Wedge is optimized for refractors with apertures of 6\" or less, safely managing the thermal load from these instruments.\u003c\/p\u003e\n\u003cp\u003eIts mechanical design replaces your standard star diagonal, and if your telescope can achieve focus with a typical diagonal, it will reach focus with the Lunt Wedge. The 2\" barrel fits securely into any standard 2\" focuser, and the eyepiece holder accepts 2\" eyepieces and accessories, allowing for wide-field scans of 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\u003eLunt 2\" vs. 1.25\" Wedge: Matching the Diagonal to Your Aperture\u003c\/h3\u003e\n\u003cp\u003eLunt offers two sizes of their Herschel Wedge to match different telescopes. While the smaller 1.25\" model is an excellent, compact choice for refractors up to 4\" in aperture, this 2\" model is the required choice for larger instruments.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" Lunt Wedge:\u003c\/strong\u003e Best suited for smaller, portable refractors up to 4\" in aperture. It is lighter and more compact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2\" Lunt Wedge:\u003c\/strong\u003e This model is necessary for refractors between 4\" and 6\" in aperture to properly and safely handle the increased light and heat. It also offers the advantage of using 2\" eyepieces, providing a much wider true field of view.\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\"\u003eIs the Lunt 2\" Herschel Wedge safe for my eyes right out of the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe wedge includes a built-in \u003cstrong\u003eND3 filter\u003c\/strong\u003e that makes it safe for imaging. However, for direct visual use, the image will still be extremely bright. Lunt strongly recommends adding a separate \u003cstrong\u003epolarizing filter\u003c\/strong\u003e to the barrel of your eyepiece. By rotating the eyepiece, you can then dim the image to a comfortable level for safe visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt 2\" Herschel Wedge on my 8\" SCT or Newtonian reflector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eAbsolutely not.\u003c\/strong\u003e A Herschel wedge must only be used with a refractor telescope. In a reflector or Schmidt-Cassegrain, the wedge would be placed after the primary and secondary mirrors, which would concentrate intense heat and light on the secondary mirror and internal components. This will cause catastrophic damage to your telescope and can lead to permanent eye injury.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will sunspots look through the Lunt 2\" Wedge in my 120mm f\/7 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe view will be exceptionally detailed. You can expect to see sharp, high-contrast definition between the dark umbra and the filamentary penumbra of sunspots. The wedge will also reveal the granular texture of the entire solar surface (the photosphere), which often appears as a subtle \"rice grain\" pattern under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I choose the Lunt 2\" wedge over the 1.25\" model for my 5\" refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2\" Lunt Wedge\u003c\/strong\u003e is specifically recommended for any refractor with an aperture of 4\" or more. The larger prism and housing are designed to better manage the heat and light gathered by the larger objective lens. Additionally, the 2\" model allows you to use 2\" eyepieces, enabling much wider true fields of view compared to the 1.25\" format.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see solar flares or prominences with the Lunt 2\" Herschel Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Lunt Herschel Wedge is a \u003cstrong\u003ewhite light\u003c\/strong\u003e solar device, meaning it is designed to show the surface of the sun (the photosphere). Features like prominences, flares, and filaments are visible in a narrow band of light called Hydrogen-alpha and require a specialized, dedicated H-alpha solar telescope or filter system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I have trouble reaching focus with the Lunt 2\" Herschel Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGenerally, no. The optical path length of the Lunt Wedge is designed to be very similar to that of a standard 2\" star diagonal. If your refractor and eyepiece combination can reach focus with a normal diagonal, you should be able to reach focus with the Herschel wedge without any issues.\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\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eLS2HW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS1.25HW\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_White_Light_Solar_Wedge_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":44967534625053,"sku":"LSS-LS2HW","price":525.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-White-Light-Solar-Wedge-2-inch-1__64330.1598229592.1280.1280.jpg?v=1684343610"},{"product_id":"lunt-herschel-wedge-1-25","title":"Lunt Herschel Wedge - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eFor Refractors up to 4\" Aperture\u003c\/li\u003e\n\u003cli\u003eIntegrated ND 3.0 Safety Filter\u003c\/li\u003e\n\u003cli\u003eOptimized for White-Light Solar Observing and Imaging\u003c\/li\u003e\n\u003cli\u003eReplaces a Standard 1.25\" Star Diagonal\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\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 Herschel Wedge - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Lunt 1.25\" Herschel Wedge provides the highest-contrast and sharpest possible white-light solar views for refractors up to 4\" in aperture. By utilizing a precision prism to safely divert excess energy and incorporating a permanently installed ND3 filter, this wedge delivers views of sunspot details and granulation that are superior to traditional front-mounted film or glass filters.\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 Solar Views for Refractors up to 4\"\u003c\/h3\u003e\n\u003cp\u003eA Herschel wedge, or solar wedge, is the optimal solution for high-resolution white-light solar observing. Unlike a filter placed on the front of your telescope, the wedge allows an unfiltered beam of light to enter the instrument, preventing the image degradation and scattering that can soften details. This Lunt 1.25\" wedge is specifically designed for refractors up to 4\" in aperture, making it the ideal solar accessory for a wide range of high-quality portable telescopes.\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\u003eBuilt-in ND3 Filter for Safe Solar Imaging\u003c\/h3\u003e\n\u003cp\u003eSafety is paramount in solar astronomy. The Lunt Herschel Wedge manages the intense energy from the sun by design, but the focused image is still far too bright for direct observation. A built-in Neutral Density (ND) 3.0 filter reduces the brightness to a level that is safe for imaging with a planetary or dedicated solar camera.\u003c\/p\u003e\n\u003cp\u003eFor visual observation, the image must be dimmed further. You can achieve a comfortable brightness level by adding a 1.25\" polarizing filter to your eyepiece and rotating the eyepiece in the diagonal to dial in the perfect 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\u003e1.25\" Format and Straightforward Focusing\u003c\/h3\u003e\n\u003cp\u003eDesigned to replace your telescope's standard 1.25\" star diagonal, the Lunt Herschel Wedge integrates seamlessly into your existing setup. It fits any 1.25\" focuser and accepts standard 1.25\" eyepieces and accessories. This ensures that if you can reach focus with a typical diagonal in your telescope, you will also reach focus with the Lunt Solar Wedge, eliminating concerns about focuser travel.\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 1.25\" Wedge vs. the 2\" Model: Aperture and Eyepiece Choice\u003c\/h3\u003e\n\u003cp\u003eLunt offers two sizes of their white-light wedge, and the correct choice depends entirely on your telescope.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 1.25\" Wedge (This Model):\u003c\/strong\u003e Is the correct and safe choice for any refractor with an aperture of 4 inches or less.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 2\" Wedge:\u003c\/strong\u003e Is designed for larger refractors, from 4\" up to 6\" in aperture. It also allows the use of 2\" eyepieces for wider fields of view. Using a wedge rated for a smaller aperture on a larger telescope is not recommended.\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 makes the Lunt 1.25\" Herschel Wedge better than a front-mounted solar filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA Herschel wedge provides superior image contrast and sharpness. Because it allows the main objective to form an image with unfiltered light, it avoids the slight image degradation caused by light passing through a front-mounted filter. This results in finer, higher-contrast details in sunspots and solar granulation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt 1.25\" Herschel Wedge safe for my eyes right out of the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFor imaging, yes. For visual use, you need an additional filter.\u003c\/strong\u003e The built-in ND3 filter reduces the sun's brightness to a level safe for cameras, but it is still too bright for comfortable and safe visual use. For observing with your eyes, you must add a polarizing filter to your eyepiece to further dim the view to a comfortable level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt 1.25\" Herschel Wedge on my SCT or Newtonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo, absolutely not.\u003c\/strong\u003e Herschel wedges are designed \u003cstrong\u003efor use with refractor telescopes only\u003c\/strong\u003e. Using a wedge with a reflector or catadioptric telescope (like a Schmidt-Cassegrain or Maksutov) will cause a dangerous buildup of heat inside the optical tube, which can permanently damage your telescope and cause severe eye injury.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the maximum aperture telescope for the Lunt 1.25\" Herschel Wedge?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Lunt 1.25\" Herschel Wedge is designed and rated for use on refractor telescopes with an aperture of \u003cstrong\u003e4 inches (102mm) or less\u003c\/strong\u003e. For refractors larger than 4 inches, you must use the 2\" Lunt Herschel Wedge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I adjust image brightness with the Lunt 1.25\" Wedge on my 80mm f\/6 refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use with your 80mm refractor, first thread a standard 1.25\" polarizing filter onto the barrel of your chosen eyepiece. After inserting the eyepiece into the wedge, you can simply rotate the eyepiece. As you turn it, you will see the image of the sun get brighter or dimmer, allowing you to set the view to your personal comfort level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see solar flares or prominences with the Lunt 1.25\" Wedge on my Tele Vue 76?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Lunt Herschel Wedge is a white-light solar device, meaning it shows the sun's surface (the photosphere), where you can see sunspots and granulation. Solar flares and prominences are features of the sun's atmosphere (the chromosphere) and are only visible in dedicated Hydrogen-alpha solar telescopes.\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\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003eLS1.25HW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eLS2HW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Max Aperture\u003c\/td\u003e\n\u003ctd\u003e4\" Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegrated Filter\u003c\/td\u003e\n\u003ctd\u003eND 3.0\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 1.25\" Herschel \/ White-Light Solar Wedge\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\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":44967534723357,"sku":"LSS-LS1.25HW","price":385.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"lunt-high-resolution-h-alpha-filter-for-ds-modules","title":"Lunt High Resolution H-alpha Filter for DS Modules","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eDesigned for 80mm and 100mm Lunt Double-Stack Systems\u003c\/li\u003e\n\u003cli\u003eEnhances Contrast for High-Resolution Solar Imaging\u003c\/li\u003e\n\u003cli\u003eReduces Faint Background Glow\u003c\/li\u003e\n\u003cli\u003eImproves Visibility of Solar Prominences and Limb 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\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 High Resolution H-alpha Filter for DS Modules\u003c\/h2\u003e\n      \u003cp\u003eDesigned for Lunt's 80mm and 100mm internal double-stack systems, the Lunt High Resolution H-alpha Filter is a critical upgrade for solar imagers seeking maximum contrast on the solar limb. This filter specifically targets the faint background glow inherent in double-stacking, improving the visibility of fine prominence structures and surface details in both the 80mm and 100mm apertures.\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\u003eSuppressing Background Glow in Lunt Double-Stack Systems\u003c\/h3\u003e\n      \u003cp\u003eAn internal double-stack (DS) system dramatically increases contrast on the Sun's chromosphere, but it introduces a faint, out-of-band glow. The Lunt High Resolution Filter is engineered to suppress this specific background signal. By filtering out this unwanted light, the sky background around the Sun becomes darker, making faint prominences stand out with greater clarity.\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\u003eOptimizing Your System for Solar Prominence Imaging\u003c\/h3\u003e\n      \u003cp\u003eThis filter is an essential tool for imagers focused on capturing the dynamic, intricate details at the Sun's edge. Because prominences are viewed against the blackness of space, any reduction in background glow directly translates to a higher signal-to-noise ratio in your final image. The result is sharper, more defined filaments and eruptive events, revealing structure that would otherwise be lost in the faint haze.\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\"\u003eWhat is the primary purpose of the Lunt High Resolution H-alpha Filter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Lunt High Resolution Filter is designed as an add-on for Lunt's internal double-stack (DS) solar systems. Its sole function is to \u003cstrong\u003ereduce the faint background glow\u003c\/strong\u003e that is an inherent characteristic of DS systems, thereby increasing contrast for imaging, particularly on faint solar prominences and limb details.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt High Resolution Filter necessary for visual observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhile it can darken the background slightly for visual use, this filter is primarily designed for \u003cstrong\u003esolar imaging\u003c\/strong\u003e. The benefits are most apparent in processed images where faint signals can be separated from background noise. For purely visual observers, the effect may be too subtle to justify the addition.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Lunt High Resolution Filter improve my images of a solar flare with an 80mm Lunt telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWhen imaging a dynamic event like a solar flare or eruptive prominence with your 80mm Lunt DS system, the High Resolution Filter helps by producing a darker background. This allows you to capture the faintest, outermost loops and plasma structures of the flare, which might otherwise be lost in the residual glow of the double-stack system.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt High Resolution Filter change the bandpass of my double-stack system?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this filter does not alter the fundamental bandpass of your primary etalon or double-stack module. It is an out-of-band rejection filter, meaning it works by blocking faint light outside the desired H-alpha wavelength, effectively \"cleaning up\" the image without narrowing the bandpass itself.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI'm imaging the solar limb with a 100mm Lunt DS system. Will this filter help resolve fine spicules?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Spicules are fine, jet-like structures on the solar limb that require high contrast to be seen clearly. By suppressing the background glow with the Lunt High Resolution Filter on your 100mm DS scope, you increase the contrast between the spicules and the background, making them easier to resolve and capture in your images.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt High Resolution Filter compatible with single-stack systems or non-Lunt telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis filter is specifically designed to address an artifact of \u003cstrong\u003eLunt's internal double-stack systems\u003c\/strong\u003e. It is not intended for, and will not provide a significant benefit to, single-stack solar setups or telescopes from other manufacturers.\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\u003eAvailable Apertures\u003c\/td\u003e\n\u003ctd\u003e80mm, 100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN (80mm)\u003c\/td\u003e\n\u003ctd\u003eHRG\/80DS\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMPN (100mm)\u003c\/td\u003e\n\u003ctd\u003eHRG\/100DS\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLunt Solar Systems Internal Double Stack (DS) Modules\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 High Resolution H-alpha 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\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":"80mm","offer_id":44967542194461,"sku":"LSS-HRG\/80","price":377.0,"currency_code":"CAD","in_stock":true},{"title":"100mm","offer_id":44967542227229,"sku":"LSS-HRG\/100","price":349.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-High-Resolution-Filter-1__88947.1598214811.1280.1280.jpg?v=1684343669"},{"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"}],"url":"https:\/\/davidastro.com\/collections\/lunt-solar-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}