{"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\" Eyepiece Holder with Brass Compression Ring\u003c\/li\u003e\n\u003cli\u003e10:1 Dual-Speed Fine Focus Control\u003c\/li\u003e\n\u003cli\u003eRack and Pinion Drive System\u003c\/li\u003e\n\u003cli\u003eAdjustable Drawtube Tension\u003c\/li\u003e\n\u003cli\u003eAll-Metal, Black Anodized 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\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\u003eFind the Finest Detail: The Lunt Solar 1.25\" R\u0026amp;P Dual-Speed Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Lunt Solar 1.25\" Rack and Pinion Dual-Speed Focuser is an essential upgrade for any observer seeking precise control over solar or nighttime views. It replaces standard, less-precise focusers with a robust, all-metal system engineered to translate the smallest adjustments into a perfectly sharp image, making the critical difference when observing delicate solar prominences or resolving tight double stars.\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 Stability of a Rack and Pinion Drive\u003c\/h3\u003e\n\u003cp\u003eAt the core of this focuser is a classic rack and pinion (R\u0026amp;P) drive. This time-tested mechanism provides a positive, slip-free connection between the focus knobs and the drawtube. For solar observers using heavier eyepieces or small cameras, this rigidity means your focus point holds firm, even when the telescope is aimed high and gravity is a factor.\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\u003eUnlock High-Magnification with 10:1 Fine Focus Control\u003c\/h3\u003e\n\u003cp\u003eThe dual-speed functionality is what sets this focuser apart for critical observation. The smaller, inner knob engages a 10:1 planetary reduction gear, slowing the focus action to one-tenth that of the coarse knobs. This level of precision is not a luxury, it is a necessity for achieving optimal sharpness on solar filaments, granulation, and planetary details, especially when seeing conditions are fleeting.\u003c\/p\u003e\n\u003cp\u003eImagine you are viewing a complex hedgerow prominence through a Lunt H-alpha scope. With the coarse knob, you get the basic shape in focus. But it is the fine focus knob that lets you slowly dial in the view until the faint, feathery structures within the prominence snap into sharp relief against the blackness of space, a level of detail that a single-speed focuser would almost certainly overshoot.\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\u003eProtect Your Eyepieces with a Brass Compression Ring\u003c\/h3\u003e\n\u003cp\u003eStandard focusers often use a simple set screw that digs into the barrel of your expensive eyepieces, leaving unsightly and potentially damaging marks. This Lunt focuser employs a brass compression ring. As you tighten the thumbscrew, the soft, non-marring brass ring tightens evenly around the eyepiece barrel, securing it perfectly centered in the optical axis without causing any cosmetic or mechanical damage.\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 Focuser Built for Durability and Contrast\u003c\/h3\u003e\n\u003cp\u003eThe entire focuser body is machined from aluminum and black anodized. This provides a rugged, corrosion-resistant housing that can withstand years of use in the field. The matte black finish is not just for aesthetics; it minimizes stray light reflections within the optical train, helping to preserve the high-contrast views that Lunt solar telescopes are known for.\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\u003eCustomize the Feel with Adjustable Tension\u003c\/h3\u003e\n\u003cp\u003eA small set screw on the focuser body allows you to adjust the tension of the drawtube. This lets you customize the focuser's \"feel\" to your liking and, more importantly, increase the friction to support heavier loads without drift. Whether you are using a lightweight 12mm Plössl or a heavier zoom eyepiece, you can set the tension so that focus motion is smooth but firm, ensuring your image stays sharp throughout your observing session.\u003c\/p\u003e\n\u003cp\u003eThe one trade-off with this robust build is its focus travel. While sufficient for most dedicated solar telescopes it was designed for, it has a shorter travel range than larger, general-purpose focusers. This makes it an ideal, compact upgrade for Lunt scopes but a less suitable choice for fast refractors that require significant in-and-out travel for different accessory configurations.\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\"\u003eWill this dual-speed focuser fit my Lunt LS40THa or LS50THa?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a direct drop-in replacement for the stock helical and single-speed R\u0026amp;P focusers found on many Lunt solar telescopes, including the LS40THa and LS50THa models. It provides a significant upgrade in focusing precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main benefit of a dual-speed focuser for solar observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10:1 fine focus knob allows you to make minute adjustments necessary to see faint, low-contrast details on the Sun's surface and chromosphere. It helps you \"snap\" the image into perfect focus to see subtle filaments and surface granulation, which is very difficult with a single-speed focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs a rack and pinion focuser better than a Crayford?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor lighter loads like a 1.25\" eyepiece, the performance is very similar. Rack and pinion focusers, like this one, offer a positive, non-slip engagement which is excellent for holding focus, while Crayford focusers can sometimes slip under heavier loads if not properly adjusted.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this focuser use a brass compression ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe brass compression ring tightens securely around your eyepiece barrel without scratching or denting it. This protects your investment in high-quality eyepieces, unlike simple set screws which can cause damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this focuser for night-time astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While designed with Lunt solar telescopes in mind, it is a high-quality 1.25\" focuser suitable for any telescope it can be mechanically adapted to. Its fine-focus control is just as valuable for splitting tight double stars or focusing on planets as it is for solar details.\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\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eRack and Pinion (R\u0026amp;P)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocus Ratio\u003c\/td\u003e\n\u003ctd\u003e10:1 Dual-Speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection Type\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrawtube Travel\u003c\/td\u003e\n\u003ctd\u003e45mm (1.77\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 12 oz (340 g)\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\"\u003e1.25\" Rack \u0026amp; Pinion Dual-Speed Focuser\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":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\/products\/lunt-solar-1-25-r-p-focuser-dual-speed","provider":"David Astro","version":"1.0","type":"link"}