Homemade 900mm Super Telephoto Lens

Over at Leica User Forum, member dkpeterborough wrote a series of posts detailing how he and a fellow member of the Peterborough Photographic Society named Tony Lovell created a beastly 900mm lens. The lens uses optics salvaged from a government flight simulator projector lens, and cost only hundreds of pounds in parts (comparable lenses cost thousands).

If you want a lens with a similar range for a similar price, but don’t have the technical know-how to make your own, check out this Opteka 800mm mirror lens on Amazon that sells for $200.