On Thursday, July 21, 2016 at 2:10:26 AM UTC-4, StarDust wrote:
This 350-Pound Soviet Spy Satellite Lens Could Be Yours for $16,500
http://www.popularmechanics.com/spac...atellite-lens/

50" long x 27.5" wide = F/5
Wonder what Mars would look like in this thing?
Still needs some costume made eyepieces.
We can talk to Mr. Nagler about it!

Given the speed, lack of ED glass then, I'd wager one element could be radioactive, with a nice 20-40% thorium oxide composition.