I've been using an old Zeiss Ikon Super Ikonta IV for a while, and I'm having some trouble with the film. As I understand it, the original film was thicker than modern film, which causes the frames to overlap; this problem grows worse with every shot.
I was just wondering if anyone has any tips on how to avoid this. I really like the camera, especially the colours, and would like to use it more.
I know there are fixes, I just can't remember exactly. If no-one here know exactly, there's the Zeiss Ikon Group on yahoo. I seem to remember that some would add something small to the take up spool. If I remember where I read it I'll pipe back up.
Near the bottom of this page on the Super Ikonta III and IV, Jurgen says, "Before loading your film, cut 2 of film paper backing from an old film and tape it to your new films leader. Youll have to experiment, you may need 2 1/2 or 3 depends on your camera of leader."
As previously mentioned, you need to add a little thickness to the take-up spool - a couple of turns of backing paper or similar is often enough. You will find differences between films too. I often just wind the arrows on past the start mark, to just by the take-up spool chamber. That seems to be enough to stop overlapping frames, though some are close.
The "red window", at least on the III, is not a red window at all, just a little spy hole - big enough to see you've got film loaded, not big enough to see the numbers.