I also shot some 50D in a Super 16 K-3 this August in a 36 Deg C. European heatwave! Great forum advice from all of the above but to help anyone else with this camera, these were my experiences: Always use a Kodak empty daylight spool as a take-up. I initially used a Russian one and the flange tolerances were different. It caused a poor pack on the take-up and about 60 feet into the film I had to put the camera in a changing bag and manually wind the build-up of slack back onto the take-up. Fortunately not a scratch on the result. You can hear when it does this very easily and I had no problems once I used a Kodak take-up. The film counter is a pain - I am currently working on a system to detect and alert that the feed spool is no longer rotating, as a clear indication that the film has run out. As a quick solution I used the camera in single frame mode with the lens off and looked at the gate, just as others have suggested. In Super 16 and a re-entered lens, you will get corner vignetting at 17mm, it is a shame that the stock lens is not wider. Adapting lenses is a pain for this camera. You can't just put on a 16mm C mount lens with an M42 thread adaptor. The Meteor Zoom, that the camera comes with, protrudes into the body quite a bit for the back focus to be correct. But on the plus side, the results from 50D were actually very good in this camera. Although scratch free, there was slight vertical cyclic jitter that is correctable in post, but many of the shots could have almost come from an Arri BL. Not quite prime lens detail but certainly close enough at some lens angles. I forgot to stop-down (in searing sunlight) after focusing for one shot and overexposed massively. Amazingly, once scanned and graded you would not know. Try that with digital cameras! The internal light meter can be powered with a 675ZA hearing aid battery (you need to pack the extra space out a bit with metal washers) This worked very well and I could not fault the exposure. Even if you accidentally leave the light meter switched on overnight, it does not seem to drain the battery.