{"title":"Lunt Focusers","description":"\u003cp\u003eLunt focusers are replacement and upgrade focusers for Lunt solar telescopes and small refractors. The range includes a 1.25\" Mini Helical focuser, 1.25\" rack and pinion focusers in single and dual speed, a 2\" Crayford style focuser with 10:1 fine focus, and backing plate and focuser assemblies for the LS80MT and LS130T.\u003c\/p\u003e\u003cp\u003eA dual-speed or 10:1 focuser makes it easier to reach precise focus at high magnification, which matters for solar imaging with small pixel cameras.\u003c\/p\u003e","products":[{"product_id":"lunt-backing-plate-focuser-ls80mt","title":"Lunt Backing Plate \u0026 Focuser - LS80MT","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables nighttime astronomical observing with the LS80MT\u003c\/li\u003e\n\u003cli\u003eRequired for white-light solar viewing with a solar wedge\u003c\/li\u003e\n\u003cli\u003eReplaces the primary H-alpha tuning assembly\u003c\/li\u003e\n\u003cli\u003eGenuine Lunt Solar Systems component for the LS80MT\u003c\/li\u003e\n\u003cli\u003eIncludes focuser and backing plate assembly\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 Backing Plate \u0026amp; Focuser - LS80MT\u003c\/h2\u003e\n      \u003cp\u003eThis Lunt Backing Plate \u0026amp; Focuser is the essential component for converting your LS80MT telescope from a dedicated Hydrogen-alpha instrument into a versatile refractor for nighttime astronomy or white-light solar viewing. It directly replaces the primary H-alpha etalon assembly, unlocking the full modular capability of the LS80MT optical tube.\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 Your LS80MT for Night Sky and White-Light Use\u003c\/h3\u003e\n      \u003cp\u003eThe modular design of the Lunt LS80MT is one of its key features, and this backing plate and focuser assembly is the key to that system. By removing the front-mounted H-alpha module and installing this unit, you transform the telescope into a high-quality ED doublet refractor ready for observing the Moon, planets, and deep-sky objects.\u003c\/p\u003e\n      \u003cp\u003eThis conversion is also required if you wish to use a Lunt White Light Solar Wedge. The wedge cannot be used with the H-alpha module in place; this assembly provides the standard focuser and light path needed for safe and effective white-light observation of sunspots and granulation.\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\u003eGenuine Lunt Component for a Perfect Fit\u003c\/h3\u003e\n      \u003cp\u003eAs an original Lunt Solar Systems part, this backing plate and focuser ensures a precise, secure fit on the LS80MT optical tube. Using a genuine component guarantees correct optical spacing and mechanical alignment, maintaining the optical integrity of your telescope system without any modification or adapters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the Lunt Backing Plate \u0026amp; Focuser for the LS80MT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis assembly allows you to convert your Lunt LS80MT from its Hydrogen-alpha solar configuration to a standard astronomical refractor. It is required for \u003cstrong\u003enighttime observing\u003c\/strong\u003e of objects like planets and nebulae, and for \u003cstrong\u003ewhite-light solar observing\u003c\/strong\u003e using a separate solar wedge.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this part to see planets like Jupiter or galaxies like Andromeda (M31) with my LS80MT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The standard H-alpha configuration of the LS80MT is designed only for viewing the Sun in a very specific wavelength. To use the telescope for any nighttime celestial object, you must remove the H-alpha module and install this backing plate and focuser assembly.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a Lunt White Light Solar Wedge on my LS80MT without this part?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. To use a white-light solar wedge with the LS80MT, you must first remove the H-alpha module and replace it with this backing plate and focuser. The optical path required for a solar wedge is incompatible with the internal etalon of the H-alpha system.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow is the Lunt Backing Plate \u0026amp; Focuser installed on the LS80MT?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eInstallation involves unthreading and removing the red Hydrogen-alpha module from the front of the LS80MT optical tube. This backing plate and focuser assembly then threads directly onto the telescope tube in its place. Always refer to your LS80MT manual for detailed instructions.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the focuser on the LS80MT Backing Plate a dual-speed model?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis is the standard Lunt focuser provided for nighttime and white-light conversion of the LS80MT telescope. It is designed to provide reliable, smooth focusing for visual observation and imaging with standard accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Lunt Backing Plate \u0026amp; Focuser assembly include a diagonal or eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This product includes only the backing plate and focuser unit. You will need to provide your own diagonal, eyepieces, and any other accessories for observing.\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      \n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \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_LS80MT_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 LS80MT 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":44967531184413,"sku":"LSS-BP\u0026F\/LS80MT","price":525.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Backing-Plate-Focuser__28421.1598214226.1280.1280.jpg?v=1684343507"},{"product_id":"lunt-mini-helical-focuser-1-25","title":"Lunt Mini Helical Focuser - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.25\" Helical Focuser\u003c\/li\u003e\n\u003cli\u003eNon-Rotating Mechanism\u003c\/li\u003e\n\u003cli\u003eT2 Male and T2 Female Threads\u003c\/li\u003e\n\u003cli\u003eBrass Compression Ring\u003c\/li\u003e\n\u003cli\u003eLocking Collar for Secure Focus\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 Mini Helical Focuser - 1.25\"\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt Mini Helical Focuser provides precise, non-rotating focus adjustment for 1.25\" accessories and camera systems, connecting via standard T2 male-to-female threads for fine control of lightweight setups.\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\u003eCore Mechanism: Non-Rotating Action with T2 Threads\u003c\/h3\u003e\n      \u003cp\u003eThis focuser's key design element is its non-rotating mechanism. As you turn the helical ring to focus, your attached camera or eyepiece remains fixed, preventing any drift in framing — a critical feature for precise composition. The standard T2 male and female threads offer a secure, direct connection for many astronomy cameras, filter wheels, and other T-threaded accessories.\u003c\/p\u003e\n      \u003cp\u003eA brass compression ring gently but firmly secures 1.25\" eyepieces without marring their barrels. Once you achieve perfect focus, a dedicated locking collar lets you fix the position, preventing any accidental shifts during an observation or imaging session.\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\u003eIntended Application: Fine-Focus Control for 1.25\" Accessories\u003c\/h3\u003e\n      \u003cp\u003eThe Lunt Mini is engineered for situations requiring fine focus adjustment on a lightweight scale. It is an ideal upgrade for guide scopes, finder scopes, or solar telescope setups that may lack a precision focuser. It also excels when paired with small, webcam-style planetary cameras or eyepieces where a minute turn of the focuser knob can mean the difference between a soft and a sharp image.\u003c\/p\u003e\n      \u003cp\u003eIts compact form factor adds minimal length and weight to the optical train, preserving the balance of your telescope. This makes it a simple, effective solution for adding a layer of precision to an existing setup without requiring a complete focuser overhaul.\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\u003eHelical Focuser Trade-offs vs. a 2\" Rack \u0026amp; Pinion\u003c\/h3\u003e\n      \u003cp\u003eWhile a helical focuser like the Lunt Mini offers excellent precision in a compact size, it's important to understand its design limitations compared to a larger rack and pinion system. Helical focusers are not intended for heavy loads; their mechanics are best suited for eyepieces and small cameras, not heavy DSLRs or large, cooled imaging sensors.\u003c\/p\u003e\n      \u003cp\u003eFor heavier imaging trains, a more robust focuser like Lunt's 2\" Rack \u0026amp; Pinion is the appropriate choice, as it provides greater stability, higher load capacity, and zero image shift. The Lunt Mini Helical Focuser fills a different role: it is the specialized tool for adding smooth, repeatable fine focus to a lightweight, compact optical system.\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 a \"non-rotating\" helical focuser and why is it important for the Lunt Mini?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA non-rotating helical focuser, like the \u003cstrong\u003eLunt Mini Helical Focuser\u003c\/strong\u003e, moves the eyepiece or camera straight in and out without twisting it. This is critical for astrophotography, as it ensures your target remains perfectly centered in the frame as you make fine focus adjustments.\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 Mini Helical Focuser used for?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003eT2 threads (M42x0.75)\u003c\/strong\u003e provide a secure, standardized connection for a wide range of astronomical accessories. You can use them to directly attach many guide cameras, planetary cameras, and filter wheels, creating a rigid imaging train that avoids the potential flexure of a standard 1.25\" nosepiece connection.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Lunt Mini Helical Focuser support a heavy DSLR or cooled astronomy camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, the Lunt Mini is designed for lightweight accessories. Its helical mechanism is not built to handle the weight of heavy DSLRs or cooled cameras, which can cause slipping or instability. For heavier loads, a rack and pinion focuser is recommended.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the Lunt Mini Helical Focuser in my optical train?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe focuser has a \u003cstrong\u003eT2 female thread\u003c\/strong\u003e on the telescope side and a \u003cstrong\u003eT2 male thread\u003c\/strong\u003e on the camera\/eyepiece side. You would typically thread it onto a T2-threaded visual back or accessory on your telescope. The other end accepts T2-threaded cameras or a 1.25\" eyepiece via the included compression ring adapter.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Lunt Mini Focuser to fine-tune the focus on my Lunt solar telescope with a ZWO ASI camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, absolutely. This is an excellent use case for the \u003cstrong\u003eLunt Mini Helical Focuser\u003c\/strong\u003e. Many Lunt solar telescopes have focusers that can be coarse for high-magnification imaging. Adding the Mini focuser in-line with a lightweight ZWO ASI camera (like an ASI120MM or ASI178MM) provides the fine control needed to achieve critical sharpness on solar details like prominences and granulation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt Mini Focuser help me achieve critical focus for planetary imaging with a webcam-style camera in my 8\" Dobsonian?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Many Dobsonians, especially those with single-speed Crayford focusers, can be difficult to focus precisely for planetary imaging. The \u003cstrong\u003eLunt Mini Helical Focuser\u003c\/strong\u003e can be added to the optical train to give you that extra level of fine adjustment needed to get Jupiter's cloud bands or Saturn's rings perfectly sharp with a lightweight planetary camera.\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\u003eLSMINI\/1.25\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 Mini Helical Focuser - 1.25\"\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":44967541866781,"sku":"LSS-LSMINI\/1.25","price":119.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Lunt-Mini-Helical-Focuser-1__19164.1598218124.1280.1280.jpg?v=1684343658"},{"product_id":"lunt-solar-1-25-r-p-focuser-single-speed","title":"Lunt Solar 1.25\" R\u0026P Focuser - Single Speed","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReplaces stock helical focusers on Lunt Solar telescopes\u003c\/li\u003e\n\u003cli\u003e1.25\" eyepiece and accessory holder\u003c\/li\u003e\n\u003cli\u003eRack and Pinion mechanism eliminates backlash and image shift\u003c\/li\u003e\n\u003cli\u003eSingle-speed design for smooth, direct focus control\u003c\/li\u003e\n\u003cli\u003eImproves stability for imaging and high-magnification visual use\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 Solar 1.25\" R\u0026amp;P Focuser - Single Speed\u003c\/h2\u003e\n\u003cp\u003eThe Lunt Solar 1.25\" R\u0026amp;P Focuser is a fundamental upgrade that replaces unstable helical focusers with a mechanically superior design engineered for critical solar observation. This single-speed 1.25\" focuser eliminates the backlash and load-bearing weakness common in stock helical units, ensuring your etalon and camera stay precisely aligned for high-magnification views.\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 Problem with Stock Focusers: Why a 1.25\" Helical Fails Under Load\u003c\/h3\u003e\n\u003cp\u003eMany solar telescopes utilize a helical focuser, a design prone to mechanical instability. When you turn a helical focuser, the entire eyepiece or camera rotates, leading to backlash and image shift that make achieving critical focus nearly impossible. This design also struggles with heavier loads, often flexing or slipping when an imaging camera is attached.\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's R\u0026amp;P Solution: A Stable 1.25\" Focuser Platform\u003c\/h3\u003e\n\u003cp\u003eThis Lunt focuser uses a rack and pinion (R\u0026amp;P) mechanism to address the core failures of helical designs. The drawtube moves in and out on a fixed track, preventing any rotation of your equipment and eliminating image shift. The result is a stable, repeatable focusing motion that can support the weight of a solar imaging camera without flexure, even as the instrument heats up during an observing session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCritical Focus for Solar Imaging: Precision for the 1.25\" Format\u003c\/h3\u003e\n\u003cp\u003eAchieving the sharpest view of solar granulation or delicate prominences requires precise focus adjustments. The direct, zero-backlash motion of this 1.25\" R\u0026amp;P focuser allows for fine control that helical systems cannot match. While it is a single-speed focuser without a micro-focus knob, its smooth action represents a significant improvement in precision, making it an essential upgrade for anyone serious about high-resolution solar work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Lunt 1.25\" R\u0026amp;P Focuser over a stock helical focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is the elimination of \u003cstrong\u003eimage shift and backlash\u003c\/strong\u003e. The rack and pinion design moves the eyepiece or camera in a straight line without rotation, providing a much more stable and precise platform for achieving and holding critical focus, especially for imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Lunt R\u0026amp;P focuser prevent my view from shifting when I change focus direction?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \"slop\" or \"backlash\" you feel when changing focus direction on a helical focuser is gone. The rack and pinion gear engagement is direct, meaning any turn of the knob translates immediately into drawtube motion, making fine adjustments much more intuitive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Lunt 1.25\" R\u0026amp;P Focuser better for imaging solar prominences?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Imaging faint, low-contrast solar prominences requires exact focus. A stock helical focuser can shift the framing or lose focus entirely when you lock it down. The stability of the Lunt R\u0026amp;P Focuser ensures that what you see on the screen is what you capture, without unwanted movement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Lunt R\u0026amp;P Focuser handle a camera's weight better than a helical focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The mechanical design of a rack and pinion system has a significantly higher load capacity than a simple helical thread. This prevents the drawtube from sagging or slipping under the weight of a dedicated astronomy camera and any associated filters, which is a common failure point for stock focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Lunt focuser difficult to install on my Lunt solar telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is typically straightforward. This focuser is designed as a direct replacement for the stock units on compatible Lunt Solar Systems telescopes. It generally involves unthreading the existing focuser and threading the new R\u0026amp;P unit in its place.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt 1.25\" R\u0026amp;P Focuser improve views of the solar chromosphere in a Lunt telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eObserving fine details in the solar chromosphere, like spicules and plage, depends on achieving perfect focus. Because the Lunt R\u0026amp;P Focuser allows for more precise, repeatable adjustments without image shift, you can more easily \"snap\" the view into focus to see the highest possible contrast and detail your telescope's etalon can deliver.\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\u003e001-147\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 Solar 1.25\" R\u0026amp;P Focuser - Single Speed\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":50904177672477,"sku":"LSS-001-147","price":237.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-125inch-RP-Focuser-Single-Speed-1.jpg?v=1769885106"},{"product_id":"lunt-solar-1-25-r-p-focuser-dual-speed","title":"Lunt Solar 1.25\" R\u0026P Focuser - Dual Speed","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e1.25\" Focuser Size\u003c\/li\u003e\n\u003cli\u003e10:1 Dual-Speed Reduction Fine Focus\u003c\/li\u003e\n\u003cli\u003e6-8 pound (2.7-3.6 kg) Load Capacity\u003c\/li\u003e\n\u003cli\u003e0.5\" Draw Tube Travel\u003c\/li\u003e\n\u003cli\u003eCNC Machined Aluminum and Brass Construction\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 Solar 1.25\" R\u0026amp;P Focuser - Dual Speed\u003c\/h2\u003e\n      \u003cp\u003eThe Lunt Solar 1.25\" Dual Speed R\u0026amp;P Focuser delivers the mechanical precision required for high-magnification solar and planetary imaging, where atmospheric seeing dictates focus on a moment-to-moment basis. Its integrated 10:1 reduction knob allows for micro-adjustments with a resolution of ±0.0002\" per rotation, while the robust rack and pinion drive securely manages a 6-8 pound load with less than 0.0005\" of backlash. This CNC-machined focuser provides the critical control needed to snap the finest details into focus within its 0.5\" of draw tube travel.\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\u003e10:1 Dual-Speed Reduction: Achieving Critical Focus Down to ±0.0002\"\u003c\/h3\u003e\n      \u003cp\u003eAt high magnifications, the critical focus zone can be microns-thin. This Lunt focuser's 10:1 fine-focus knob translates a full turn into an incredibly small drawtube movement, achieving a fine focus resolution of ±0.0002\". This level of control is essential for teasing out solar granulation, resolving details in Jupiter's cloud bands (GRS), or splitting tight double stars where a standard focuser would overshoot the mark.\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\u003eZero-Backlash Rack \u0026amp; Pinion Drive: Supporting a 6-8 Pound Imaging Train\u003c\/h3\u003e\n      \u003cp\u003eUnlike friction-based Crayford designs that can slip under load, this focuser's rack and pinion drive provides a positive, mechanical engagement. It is engineered to support a 6-8 pound (2.7-3.6 kg) payload without flexure or image shift. With backlash adjustable to less than 0.0005 inches, you can change focus direction without encountering dead zones, ensuring your target remains centered and sharp during an imaging run.\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\u003eRotatable Body \u0026amp; Brass Compression Ring: 360° Framing Flexibility\u003c\/h3\u003e\n      \u003cp\u003eThe entire focuser body is rotatable, allowing you to orient your eyepiece or camera to the most comfortable angle or to perfectly frame your target without loosening any optical components. The drawtube terminates in a non-marring brass compression ring, which secures your 1.25\" accessories firmly without scratching the barrel, preserving the value and finish of your eyepieces and 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 10:1 R\u0026amp;P vs. Standard Single-Speed Focusers: An Essential Upgrade\u003c\/h3\u003e\n      \u003cp\u003eWhile a standard single-speed focuser is adequate for low-power viewing, it becomes a point of frustration for high-resolution work. The Lunt 10:1 dual-speed mechanism is not a luxury but a fundamental requirement for critical observation. The coarse knob gets you close, while the fine knob lets you dial in perfect focus without the vibration or over-correction inherent in single-speed systems, making it a mandatory upgrade for any serious solar or planetary observer.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Lunt 10:1 focuser improve imaging the Sun's granulation?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eSolar granulation and other surface details are low-contrast features that are only visible in moments of steady atmospheric seeing. The \u003cstrong\u003e10:1 fine focus ratio\u003c\/strong\u003e allows you to make minute, controlled adjustments with a resolution of \u003cstrong\u003e±0.0002\"\u003c\/strong\u003e, enabling you to precisely hit the point of sharpest focus during those brief, clear moments without introducing vibration or overshooting the mark.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Lunt dual-speed focuser's 6-8 pound capacity handle a binoviewer?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The \u003cstrong\u003e6-8 pound (2.7-3.6 kg) load capacity\u003c\/strong\u003e is more than sufficient for most 1.25\" binoviewers and eyepiece pairs. The rack and pinion drive prevents the slippage that can occur with friction-based focusers under the weight of a binoviewer, ensuring your focus remains stable.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of a Rack \u0026amp; Pinion drive on the Lunt focuser?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA \u003cstrong\u003eRack and Pinion (R\u0026amp;P)\u003c\/strong\u003e drive uses geared teeth for a positive mechanical connection between the knob and the drawtube. This design is superior for heavier loads as it physically cannot slip, unlike Crayford focusers which rely on friction. This makes the Lunt R\u0026amp;P ideal for imaging setups or heavy visual accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 0.5\" draw tube travel on the Lunt focuser enough for my eyepieces?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e0.5\" (12.7mm) travel\u003c\/strong\u003e is designed for fine-tuning focus on Lunt solar telescopes, where the primary focus position is relatively fixed. It is generally sufficient for a set of eyepieces that are close to parfocal. However, if you are switching between accessories with vastly different focal points, you may need to use the telescope's main focuser or extension tubes to achieve initial rough focus.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"rotatable\" feature on the Lunt 1.25\" focuser do?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe entire focuser body can be rotated 360 degrees relative to its mounting base. This allows you to position the focusing knobs for comfortable access or to rotate your camera to achieve the best composition for your target without having to loosen the camera or eyepiece in the drawtube.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I adjust the backlash on the Lunt 10:1 focuser?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe focuser is designed for minimal backlash of \u003cstrong\u003e\u0026lt;0.0005 inches\u003c\/strong\u003e when properly adjusted. Typically, small set screws on the focuser body allow you to adjust the tension and mesh of the pinion gear against the rack. This ensures immediate response when you change focusing direction, which is critical for tracking moving targets or reacting to changing seeing conditions.\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\u003eFocuser Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDrive System\u003c\/td\u003e\n\u003ctd\u003eRack and Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFine Focus Ratio\u003c\/td\u003e\n\u003ctd\u003e10:1 reduction\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLoad Capacity\u003c\/td\u003e\n\u003ctd\u003e6-8 pounds (2.7-3.6 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDraw Tube Travel\u003c\/td\u003e\n\u003ctd\u003e0.5\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePositioning Accuracy\u003c\/td\u003e\n\u003ctd\u003e±0.001 inches (±0.025mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFine Focus Resolution\u003c\/td\u003e\n\u003ctd\u003e±0.0002\" per knob rotation\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBacklash\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.0005 inches when properly adjusted\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRotatable Body\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompression Ring\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eCNC machined Aluminum and Brass\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCoarse Focus Resolution\u003c\/td\u003e\n\u003ctd\u003eStandard rack engagement\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eParameter\u003c\/td\u003e\n\u003ctd\u003eValue\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 Solar 1.25\" R\u0026amp;P Focuser - Dual Speed\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/lunt-solar-system-warranty\" rel=\"noopener\" target=\"_blank\"\u003eLunt Solar Systems 5-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":50904190255389,"sku":"LSS-001-148","price":376.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Lunt-125inch-RP-Focuser-Dual-Speed-1_fc0df4eb-df09-4f6d-8337-44ec56ba86e2.jpg?v=1769887049"}],"url":"https:\/\/davidastro.com\/collections\/lunt-focusers.oembed","provider":"David Astro","version":"1.0","type":"link"}