I bought this camera by mistake, thinking it was a 4x5. Does anyone know if there is film for this camera or if it can be converted to a film size like 120mm. It came with a 135mm F/4.7 lens and also has a focal plane shutter in the camera body, 135mm lens is also in a shutter that has T,B, and shutter speeds from 1 sec. to 1/400 sec. Lens can be open and closed without releasing the shutter by a little lever on the lens when the lens is cocked. The camera is a Graflex Speedgraphic 3 1/4