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The Vixen SD Reducer HD is an aplanatic focal reducer desigend to work with Vixen AX103S astrograph and Vixen VC200L Visac catadioptric. When used together the Vixen SD Flattener HD it can be used also onto Vixen SD optics. It delivers high contrast flat field over an imaging circle up to 44 mm, perfect also for full frame (24x36 mm) CCD/CMOS sensor.
The Vixen SD Reducer HD Kit includes the SD Flattener HD filed flattener, the SD Reducer HD aplanatic focal reducer, the EX Tube 66 extension tube and the specific extension tube to be used along the SD81S. Complete correcting and reducing lens system for Vixen SD81S, SD103S e SD115S optics.
This focal reducer is designed for Vixen's VMC200L, VMC260L and VMC330L reflector telescopes. Reduces focal length by 0.62x; Changes VMC200L to F/6, VMC260L to F/7.1 and VMC330L to F/8.1. Weight: 183 g. Backfocus: 63.5 mm.