Askar 71F

Explore the Universe with the Askar 71F Quadruplet Flat-Field Astrograph   Optimal Optical Design: Features a quadruplet air-spaced APO lens with one piece of ED glass, effectively reducing chromatic aberration and supporting 44mm full-frame imaging. Self-Flattened Convenience: The Askar 71F eliminates the need for additional flatteners or complex back focus calculations, simplifying the setup for astrophotography. Lightweight and Portable: Weighing only 2.5kg (OTA) and 3kg with tube rings and dovetail plate, it's designed for easy transport and setup, perfect for adventurers. Dual Usage: Equipped for both visual observations and astrophotography, enhancing its utility for all users. Visual Observation Accessories Included: Comes with an 8mm eyepiece (60x magnification), a 20mm eyepiece (25x magnification), and a 1.25-inch 45° erecting prism for correct image orientation. Enhanced Connectivity: Includes a photographic extension tube with M480.75 and M540.75 adapters, plus a built-in 2-inch filter thread for seamless attachment of various cameras. Advanced Mechanical Design: Features a retractable dew shield for compact storage, CNC machined tube for durability, and matting paint inside the dew shield to minimize light reflections. Versatile Mounting Options: Comes with a standard 230mm Vixen dovetail plate with slots for 1/4 and 3/8 screw holes, allowing easy tripod attachment. Aesthetic and Functional: The sleek blue and white color scheme enhances its visual appeal, complemented by practical features like dual finder bases and a multifunctional handle with a finder base slot. Precision Focuser: Equipped with a dual-speed R&P 2.4-inch focuser, featuring a 1:10 fine adjustment and a 360° scale field rotator for accurate alignment. The Askar 71F stands as a pinnacle of affordability and performance, ideal for both the seasoned astronomer and the amateur looking to delve deeper into the cosmos with ease. Specifications 71F Aperture size 71mm Focal length 490mm Focal ratio f/6.9 Objective lens Quadruplet air-spaced APO(including one ED glass) Image circle 44mm Maximum accessory connection (with the focuser fully retreated) Imaging mode: 82.5mm (from the base of M48×0.75 male thread） 100.5mm（from the base of M54×0.75 male thread) Observing mode: 117mm（from the end of 1.25" eyepiece holder） 127mm（from the end of 2" eyepiece holder） Total length 372.5mm(including 1.25" adapter as dew shield contracted） 430.9mm(including 1.25" adapter as dew shield fully stretched） 415mm(including the photographic adapter as dew shield contracted） 473.4mm(including the photographic adapter as dew shield fully stretched） Net weight 2.5kg Gross weight(Including tube ring&dovetail plate） 3.0kg 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 71F OTA， a pair of tube rings, a handle, a Vixen 230mm dovetail plate, a set of photographic adapters, a 1.25" 45° erecting prism, an 8mm eyepiece, a 20mm eyepiece Connection Diagram Locking Screw Diagram Software and Docs 71F Flat-Field User's Manual After Market Focuser Installation