The Vixen 3666 is a Focal Reducer for ED81S, ED103S, ED115S. This high quality reducer for photographic use is designed to shorten the effective focal length of your ED81S, ED103S or ED115S refractor. This will allow for shorter exposure times and a wider field of view.
For those using an SLR or Digital SLR, you will need the optional "Direct Wide Photo Adapter" 3878 or 3876 for the Canon EOS type cameras and the appropriate T-ring to fit your camera.
|Compatible with||ED81S, ED103S or ED115S refractor|
|Reduces||.67X to F 5.5|
|Dimensions||3 x 3 x 2 inches|