Hello, I’ve spent a long time searching through forums and scouring my cam menus and still cannot find a reason for my problem. I have two Canon C70s both with EF adapters for my non RF lenses. In theory, I don’t think the adapter should be changing the focal length of the lens, and it doesn’t on one of my cameras. However, the other camera does always change focal lengths, my 70-200 registers as 50-155 (this is what the c70 displays and you can tell visually that it’s wider than it should be). I truly don’t understand why it would be different between my two c70s, and I can’t find any setting disparities between the two that would make this happen. I also can’t seem to add an exposure bar to the display of one of my c70s despite enabling it in the display settings, but that’s a different issue that I’m less worried about. I’ll probably end up trying to factory reset or update firmware to see if that changes anything but figured I’d ask first to see if anyone had any ideas
Well I know nothing about C70 cameras so cannot give specific advice but would suggest that the factory reset should be the first option. If both your cameras are running the same software version then a software update is unlikely to be of much help.
Based on pages 30 and 31 of your user manual i would suggest its possible you mount adapters/ cameras are not running the same firmware update when it comes to lens compatibility. The adapter already notes that it is providing a .7x magnification and is the reason that a 70-200 would perform as 50-150, so it is also possible you lens correction settings from these pages are not matching between the two cameras, where the camera is correcting the lens to look identical as it would be on an EF mount camera. https://gdlp01.c-wss.com/gds/4/0300040134/06/eosc70-im7-en.pdf I have no experience with the cine cameras, i just spent a couple of minutes in the user manual. But I would expect a wider image on a .7x mount converter if no other in camera changes were applied to the lens. From the website:
