I installed a neutral density filter over a pack of Polaroid 600 film and got it loaded in my stainless and leather SX-70. Unfortunately, the black pack cover didn't eject properly and jammed leaving the mirror in the up position. I removed the bent black pack cover but can't take a picture. I also have a white plastic Model 2 SX-70 with a broken viewing lens. I put the pack in the white one and it works but I can't focus or compose. This was taken at infinity and pointed at the subject. The ND filter did it's job. The exposure was fine. An answer on a SX-70 forum suggested putting the black pack cover back in the pack and that would cause it to be automatically ejected and return the mirror. Didn't work. The camera made little squeaking sounds but that was all. It was suggested that the motor might be too weak. I will get another pack of 600 film and try one more time. Then it will be time to look for another SX-70. My white one is not repairable by me. I must have a SX-70. They are too much fun. Does anyone reading this have a SX-70 laying about that wants to be used? I accept all donations.