Askar 71F Flat-field Astrograph 自平场摄星镜：https://eshop.astro.hk/hk/catalogs/products/fbc7203c-5299-41eb-9d80-23d6ec3e9838

星河科研社为锐星光学Sharpstar / Askar的香港独家总代理，Askar 71F 自平场摄星镜定价HK$3980，现已于eshop上架。

Galaxy Scientific Group is Hong Kong sole dealer of Sharpstar and Askar. The Askar 71F Flat-field Astrograph is priced at HK$3980 and is now available on eshop. 

Askar 71F是一款多用途自平场摄星镜，口径为71mm，焦距为490mm，原生焦比F6.9的天体摄星镜。71F本体仅2.5kg，含抱箍及燕尾板的整体重量为3kg。标配摄影延长管、2.4吋齿轮齿条式双速调焦器及三款1.25吋目视配件：8mm目镜、20mm目镜和45度正像棱镜。

Askar 71F is an affordable and high-quality versatile self-flattened Astrograph with an aperture of 71mm, a focal length of 490mm, and a native focal ratio of F6.9.  It weighs only 2.5kg and the gross weight is 3kg (including the tube rings and dovetail plate). Including a photographic extension tube, a dual-speed R&P 2.4-inch rigid focuser and three observation accessories: an 8mm eyepiece, a 20mm eyepiece, and a 1.25-inch 45° erecting prism.

Askar 71F四片式镜片组合包含一片ED玻璃，有效减少色差。支援全片幅拍摄，週边星点品质优异。自平场设计让使用者无需购买平场镜及计算平场镜的后截距。Askar 71F摄影延长管内含2吋滤镜螺纹，有M48*0.75以及M54*0.75规格的接环，可直接连接传统单眼相机或专业天文相机。只需直接接上任意成像配件，合焦后就是最佳的拍摄状态。

The Askar 71F adopts a quadruplet air-spaced APO lens design, including one piece of ED glass to reduce chromatic aberration. It supports 44mm full-frame imaging with great performance of the surrounding star points.The self-flattened design allows users to avoid calculating the back focus and buying additional flatteners. The Askar 71F extension tube includes a 2-inch filter thread and comes with M48*0.75 and M54*0.75 adapter rings, allowing direct connection to traditional DSLR cameras or professional astronomical cameras. Simply attach any imaging accessory, and once focused, you are in the optimal shooting state.

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