Vixen ED 100Sf APO Refractor with Porta Mount

The Vixen ED 100Sf APO refractor features high-grade glass and quality components. Coupled with a medium f/9.0 focal ratio, the ED "S" series provide a sharp, color-free image of high contrast. For the astronomer that wants the best value for the dollar in a 4" APO, this is the one to buy.

Apochromatic refractors from Vixen have extra-low dispersion (ED) lenses that depress residual aberration to achieve a high level of performance. The ED100Sf features a Crayford focuser for smooth operation without backlash. Performs nicely on the Porta Mount for visual observing or as a travel scope, or mount the OTA to a larger telescope for use as a guidescope.