Quote Originally Posted by Dr Croubie View Post
Aero Ektars are one that I've heard of before but didn't think about including in this search, I'll have a look for them too.
Don't waste your effort. USAF had cameras that shot 9" x 18", 18" x 18", and even a few larger but lenses for these monsters extremely hard to find, large, heavy and, nowadays, expensive. To get an idea of what to look for, go to the catalogs URL I gave you and look at USAF lenses.