Focal reducers shorten the effective focal length of telescopes to provide wider visual fields and faster f-ratios for astrophotography. The Vixen focal reducers are for astrohpotograhpy only, with the exception of the Focal Reducer ED80S/ED102S/FL102S (AP-FR-3637) that can also be used visually.
Focal Reducer VC200L :
Reduces the effective focal length to about 71%. Shortens the focal length of the VC200L from 1800mm to 1278mm (f/6.4).