Both camera have an 8mm wide fixed slit. The lens is capped while winding on. As built, as an Attrape non-working display, much inside needs to be changed, production variations sometimes make this difficult. The supplied lens is useless, the shutter supplied doesn’t cover right....but with perseverance, or $$$$ to Mr Kim, the camera Leitz built as a display can actually function exactly the same as it did for Barnack. I really like it, small and very pocketable, it took me a few rolls to “have faith” in it but lots of good negs proved they can do the job.~~~~~~~~ actually, shutter speeds on #80 (mr kim) the speed adjuster Barnack used is functional and gives approx 1/200 and 1/300 speeds. #9 has one speed , about 1/250.