So I recently bought my first Bolex off ebay and it just arrived. The person who sold me the camera also sold 3 Kern-Paillard lenses at the exact same time, so I assumed they were from the camera but they separated them so that they could make more by selling them individually, so I bought two of them. One arrived today along with the camera, a Switar 1:1.4 25mm lens. What I didn't realize until after I bought it, though, is that it is an AR lens, while my camera is a reflex. Still, I didn't think it would be a big problem. However, while it is a C-mount lens, the end part is too long and so the lens won't screw fully into the camera. So is there some kind of adapter to fix this? Or is my only option to sell this lens and get another?