Whats wrong with the original lens? It isn't hard to remove, should be able to unscrew the retaining ring at the rear of the lens inside the camera. Finding a replacement lens that diameter might be difficult, maybe not. If its a 127mm, its good for 4x5 plus some movements(view camera), slightly wide field and sharp. You just need to gut the insides of the body, and affix a 4x5 back or some other means of retaining a 4x5 film holder, and you are shooting.