กล้องดูดาว Sharpstar SCA260 v.2 260mm f/5 Super Ashperical Cassegrain Astrograph with Integrated Field Flattener & Carbon Fiber Tube Ver2.1 (ฟอกัสเซอร์หมุนได้)
The Sharpstar SCA260 is a fast focal ratio Cassegrain astrograph for serious astrophotographers that delivers superb images at an affordable price. With an aspherical f/5 primary mirror of 260mm aperture, the SCA260 includes an integrated three-element air-spaced corrector that produces a huge 80mm image circle. With a full-frame camera, the 1300mm focal length of the SCA260 delivers a big 1.5o x 1.0o field of view that’s flat and well corrected right to the edge.
Note: Version 2.1 improves on the v2.0 by having the rotator between the telescope and focuser (therefore focuser can also be rotated). Pictures below mostly shows v2.0 but new orders will receive the latest 2.1 version.
80PHQ inherits the optical design of the PHQ family, adopting a 3+1 quadruplet lens structure which contains two pieces of ED glass that can effectively reduce chromatic aberration and enhance clarity and sharpness. It’s worth mentioning that all astrographs from the PHQ family come with an integrated lens combination rather than simply placing three major lenses and a corrector together in a line. In other words, the whole optical system cannot solely perform without any piece of these lenses. This structure design leads to a more rational lens arrangement, better vignette control and superior image quality. The focal ratio of 80PHQ is f/7.5. It’s a “long” focal-ratio astrograph compared with other counterparts from Askar. It’s a little bit longer even compared with 107PHQ which is f/7 in focal ratio.