Description

52-220ED Star Guide Mirror + Star Guide Ring Astronomical Telescope Optical System Refractive Astronomical Telescope Bracket Type No Bracket Main mirror aperture 50-100mm 1、Support SLR focusing 2、Excellent internal extinction Multi-functional: it can be used as a star guide mirror, a straight stargazer, a 45-degree full forward stargazer (need to add Sirius 1.25 inch 45-degree forward mirror); it can also be used as an ordinary small telescope, and it can also be used as a camera lens. 2, strong rigidity: hoop made of 304 stainless steel M6 screws, and the mirror barrel contact area, solid exception; using 0.7 mm hard plastic sleeve, that is, to increase the contact area, but also to avoid the aluminium screws to protect the small deformation caused by the rubber head; widely criticized double helix focusing seat replaced with threaded focusing, simple structure, locking ring locking there will be no shaking after; the stability of the whole system has just been! 3, good optics: 52 mm caliber ED lens, the effective diameter of up to standard 50.2 mm or so; the use of multi-layer broadband coating; lens column surface all baking paint into black (not to take a black pen to paint Oh, is baked out), aberration design retained some of the chromatic aberration, will be the ball difference control to a better level, because of chromatic aberration on the imaging clarity of the impact of the small, and residual larger ball difference on the imaging clarity of words Great impact on the image clarity, the intuitive feeling is that the image is not sharp, not transparent, and can not well support the high multiplier, star guide star point will also be fat because of the spherical aberration 4, the optical axis is: each mirror will be issued before the detection system optical axis, at least to ensure that the second figure level, can be high times to verify the Avery spot. Calibre: 52mm Focal length: 220mm