![{[en]:Vixen Optics f/5.2 Focal Reducer for the ED81S](https://do7pnovh3scvz.cloudfront.net/images/detailed/72/Vixen_Optics_3666_f_5_2_Focal_Reducer_for_1233145988_530638.jpg?t=1708872575 "{[en]:Vixen Optics f/5.2 Focal Reducer for the ED81S")
The Vixen Focal Reducer for the ED81S, ED103S, & ED115S telescopes is a high-quality reducer for imaging use, designed to shorten the effective focal length of your refractor. Shortening the scope s effective focal length quickens exposures and widens the field of view.
To use this focal reducer, you ll need both the Vixen #3878 Direct Wide Photo Adapter and a camera-specific T-mount for your SLR camera. The outer portion of the T-mount is removed, and the remaining element of the T-mount affixes to the Direct Wide Photo Adapter. You then attach both pieces on to your SLR like a lens, and on the other side of the Direct Wide Photo Adapter you screw in this focal reducer. Together your SLR + T-Mount + Direct Wide Photo Adapter + focal reducer thread in to the rear of the focuser barrel upon the refractor.
With ED81S, effective focal length & aperture becomes 419mm f/5.2
With ED103S, effective focal length & aperture becomes 533mm f/5.2
With ED115S, effective focal length & aperture becomes 596mm f/5.2
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