The Vixen Universal Plate for the Porta Mount allows you to attach spotting scopes, binoculars, DSLR lenses, or other telescopes to the fine Porta or Porta II altazimuth mount. If you with to use the Porta mount with a camera tripod with 1/4"-20 threaded screw, you will also need the #3942 camera tripod adapter.
There are a slew of different holes on this universal plate; click here for a schematic drawing from Vixen's Japanese site(temporarily disable popups in your browser if necessary).
