Askar 60F Flat Field Quad Refractor 60mm aperture 408mm focal length f/6.8 focal ratio Quadruplet APO design 1 ED glass element Supporting full frame (44 mm image circle) No need to calculate the back focus Built-in Flattener Retractable lens hood 360° rotator 2 Finder bases 2.4 inch R&P focuser 1:10 fine adjustment 1.25/2'' visual adapter 230mm Vixen dovetail plate 4-piece photographic adapter set The Askar 60F adopts a quadruplet air-spaced APO lens design, including one piece of ED glass, which can effectively reduce chromatic aberration. The Askar 60F supports 44mm full-frame imaging with great performance of the surrounding star points. The Askar 60F is a self-flattened design that allows users to avoid calculating the back focus and buying additional flattener, after attaching the imaging accessories, users can use it for imaging after the OTA is in focus. With practicality and versatility in mind, the Askar 60F's weight and size are effectively controlled, making it easy to carry and use. The Askar 60F OTA weighs only 2.5kg and the gross weight is 3kg (including the tube rings and dovetail plate). The Askar 60F is versatile in its use, allowing for both visual observation and astrophotography. Just add a diagonal & eyepiece for visual use or your favorite DSLR or astro imaging camera & adapter for terrestrial imaging or astrophotography. The Askar 60F comes standard with a photographic extension tube, which includes M48*0.75 & M54*0.75 adapters. The extension tube contains a built-in 2-inch filter thread for easy shooting connections. No matter whether connecting a traditional DSLR camera or a professional astronomical camera, it is very convenient to use. When users go out, they can directly connect the imaging accessories to record the beautiful view at any time. The mechanical design of the Askar 60F itself adheres to Askar's consistent philosophy of taking into account the user's habits and minimizing the user's invisible costs. The dew shield of the Askar 60F is a retractable design, further shortening the overall length and increasing portability. The entire lens tube of Askar 60F is crafted using high-quality CNC machining. The dew shield' interior is covered with matte paint to effectively reduce stray light reflections. A finder base is included on the handle at the top of the tube rings, and there are two additional finder bases on both sides of the focuser, which not only eliminates the need for disassembling when changing the position of the finder scope but also provides additional mounting positions for other astronomical accessories. In terms of the focuser, the Askar 60F is equipped with a dual-speed R&P 2.4-inch rigid focuser with 1:10 fine adjustment and a 360° scale field rotator at the rear end for precise angle adjustment. The Askar 60F's dovetail plate is a 230mm standard Vixen dovetail plate, which slotted 1/4 screw holes as well as 3/8 screw holes for direct tripod attachment. Specifications Parameters Aperture size 60mm Focal length 408mm Focal ratio f/6.8 Objective lens Quadruplet air-spaced APO(including one ED glass) Image circle 44mm Maximum accessory connection (with the focuser fully retreated) Imaging mode: 81mm (from the base of M48×0.75 male thread） 99mm（from the base of M54×0.75 male thread) Observing mode: 120mm（from the end of 1.25" eyepiece holder） 130mm（from the end of 2" eyepiece holder） Total length 289mm(including 1.25" adapter as dew shield contracted） 323mm(including 1.25" adapter as dew shield fully stretched） 336mm(including the photographic adapter as dew shield contracted） 369mm(including the photographic adapter as dew shield fully stretched） Net weight 2.36kg Gross weight (Including tube ring&dovetail plate) 2.86kg Rear-end thread type M64×0.75-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75 (with M48×0.75 filter thread) Standard package items A 60F OTA，a pair of tube rings, a handle, a mm Vixen dovetail plate,a set of photographic adapters
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