Sigma 100-400mm f5-6.3 DG OS HSM Contemporary for Nikon F Prime Lens or you're thinking of converting

or you're thinking of converting to a plate camera

considering

It's a 200mm f3

It's definitely better than your average drugstore tripod

8 Retina-Tele-Xenar is a telephoto lens for Kodak Retina Reflex cameras

Sigma 100-400mm f5-6.3 DG OS HSM Contemporary for Nikon F Prime Lens or you're thinking of convertingThe Sigma 100 400mm f5 6. 3 DG OS HSM Contemporary is a reasonably compact full frame telephoto zoom lens with quick focusing, excellent image quality, and an effective image stabilizer. Cosmetic condition is good, with some finish wear; optics show light dust. This lens is designed for Nikon F mount DSLR cameras, but it will also work on most autofocus Nikon F mount film SLRs.