jerryc41 wrote:
This 1,000mm lens will be going up for auction. It's the only one ever made, so don't look online to see what others have sold for.
http://www.dpreview.com/news/2530167073/rare-1964-nasa-1000mm-f-4-5-super-telephoto-lens-to-be-auctioned-this-fall
http://www.diyphotography.net/enormous-rare-canon-mount-1000mm-nasa-lens-goes-sale/
I explored this link even more and stumbled on Canon's 5200mm, 1:14 lens in Japan. So large it appears you need a forklift to move it. Only 3 exist.