goamules
Well-known
Yes, there are a few c-mount lenses that cover the APS-C sensor, mostly over 50mm. But for telephoto purposes, some of these 16mm movie camera lenses are very good. The first I've been using on my XE-1 is a Kern 75mm Macro Switar, with pre-settable aperture. It is a very sharp, contrasty lens.