Oddly enough the camera came with a square lens plate/flange fitted but no lens. I just tried this with a Penrose-Wray process lens which I picked up very cheaply (need servicing - any suggestions?) and of course it fits perfectly! So I'll keep this to go with the camera (although the lens is probably 20-30 years earlier in date) simply because it seems like a good match albeit from a very different form of photography. [FWIW I remember making colour separations physically when studying - a really exacting palaver!]