Originally posted by Wheatfield The A lens doesn't have a chip, so the camera has nothing to recognize. Input focal length manually when the camera asks for it on startup. You will not have FL available in EXIF though. (Atleast not that I've been able to make happen).
Try cleaning the contacts, I use a pencil eraser and rub then gently. It doesn't take much effort to clean them.
Regarding focus, I am going to presume that you've checked the obvious, like your diopter correction and that you've inspected the lens carefully. If this is your first manual focus lens, it's possible that your focus screen isn't quite shimmed in correctly and you haven't noticed before.
Ah. I'd thought the configuration of contacts told the camera what focal length. That answers that much. I don't understand why the chimping info should be claiming these wild shutter speeds, though.
I'm in the process of inspecting this lens as we speak, actually: the seemingly-bizarre behavior seemed to mean possibly I should just stop there and return it.
It's not the first manual focus lens I've put on here, but in some ways it may as well be. (I snagged an M 'takumar bayonet,' a 135, but haven't gotten to playing with it too much, my health's been so-so at best most of the time I've had this camera, actually, so I've been waiting for better eyesight and concentration days to set up and do any fine-tuning of focus. And in the case of that 135, waiting for steadier hands. )
I really hope the focus screen isn't out of alignment: I've had my suspicions, but haven't been able to really settle in and figure this out or see if there may be simple front-or-back-focus issues and how to save the lens info.
The contacts do seem to be clean, I've given them a quick going over. I suppose I should be more thorough for the sake of any troubleshooting process.