henry link
Well-known member
I haven't had a chance to try it on the 80mm Pentax. The importer only mentions Zeiss Diascopes and Chinese spotting scopes made by Synta and sold under the Celestron brand name. The Synta scopes are probably sold under other brand names as well. The threads on the eyepiece collette may be the Zeiss 44mm standard that they used on their old astronomical scopes. An adapter ring fits into the collette. It has about 35mm threads which the 1.25" etepiece barrel screws into. Baader could easily make adapter rings to fit other scopes as long as the eyepiece can reach focus. I have found that the Zeiss 2" Diascope eyepiece adapter will fit the Baader collette, but that's no help on birding scopes.