Handpicked quadr. 4-lens Apo It is a refractor especially designed for both astrophotography and visual observation. Its objective is composed of 3-group 4-element lenses including two ED lenses. Photographic field is 90mm in diameter and star images are less than 20 microns even at the marginal field. A 6x7 camera can be used on it. Its lens shade is extendable.
. D= 108 mm f= 540 mm , 4.25"F/5, set of tuberings, 50 mm Vixen Finder, fully warrantee , asking uS $ 2,790 incl. shipping