Cassegrain Focus 1 Comment / Classic Telescopes / By Al Paslow / 1 minute of reading Images showing the mirror cell of a Cassegrain focus instrument.
Telescope World – 12.5 inch Newtonian Classic Telescopes / By Al Paslow / 2 minutes of reading This is a 1979 to 1986 Vintage 12.5 inch Newtonian F 4.5 reflector built by Telescope World.