Dave is correct about checking the focus. I cut a piece of glass and frosted it just for this purpose. Make sure this sits on the inner rails, the outer ones guide the film. Argus made a viewfinder that clipped into the flash shoe. This has the three lens settings, 35mm, 50mm, 100mm, and the range in feet. Your lens should focus with the rangefinder. I have the C33, C4, and C44, Steven.