Hi all! I recently shot my first roll with a Konica Autoreflex TC that I got off eBay mainly for the AR Hexanon 1.8/40 it came with. When I got the roll back from development, most of the shots (3 out of 4) were completely blank, as if the shutter didn't open at all. Successful shots were randomly spread throughout the roll and were perfectly exposed. Furthermore, the spacing seems correct, i.e. blank segments between good frames correspond to either single or multiple frames, as indicated by 8 sprocket holes per frame. The Autoreflex TC has a mechanical shutter and while shooting the roll, everything sounded OK, the relatively loud thud of the metallic curtains was there for every shot, without any audible difference from the previous or the next one. Frame counter worked OK and the rewind lever turned OK while advancing the film, The first and last shot registered OK and there were no exposure problems in the successful shots, nor did anything register on the blank frames (no bands, dark corners, half frames, etc) they are just completely blank. Here comes the spooky stuff: While dry testing the shutter in manual mode with the film door open both before and after shooting the roll in question, everything seems OK: I tripped the shutter on every single speed in manual mode for more than 50 times for each speed and it fired correctly every single time. I repeated the same with the lens in AE mode (shutter priority) and every single time the shutter opened correctly with the lens aperture varying as expected between shots, corresponding to what the needle showed in the viewfinder. I shot a second roll with it, taking care to shoot each photo both in AE and manual mode, and the same thing happened: Some shots are completely blank in random order, sometimes both AE and manual versions of the same shot registered OK, sometimes one is missing, sometimes both are missing. I'm really baffled by this, as was my camera repair guy when I described the problem to him on the phone. Any ideas? Is it possible that the presence of film somehow causes the shutter to fail randomly?