1960s homemade 8" x 1.25" parabolic telescope primary mirror made of borosilicate (Pyrex/UL22). Mirror is in excellent shape with a practically brand new coating; I am an amateur telescope/mirror maker and Ronchi tested this one - overall looks to have a decent figure. Focal length about 76" making this f/9.5.
Perfect for your own affordable Dobsonian telescope build. A 1.3-1.5" secondary mirror would be ideal for most tube configurations and focusers. Thanks for looking!
On Apr-12-24 at 11:57:31 PDT, seller added the following information:This came from a collection of various telescope making items, many of which were owned by Pierre Schwaar - I think the labels are his handwriting but no clue if he made this mirror.