Mamiya M645 Pro AE Prism indicates overexposure at all settings

[memzilla]

Hello everyone,

When I went to use my Mamiya M645 Pro TL today, the AE prism indicated overexposure (flashing OVER in the viewfinder) at all aperture settings.

It was bright and sunny and I had 400 ISO film in one back and 100 ISO film in the other back.

I had the shutter speed dial set to 'A'. I tried all three metering modes.

I checked that the ISO dials on the backs were properly set, and that the lenses were set to 'A' and not 'M'.

I tried both backs and re-attaching the prism, to no avail.

I would appreciate any suggestions as to what might be the cause.

Thanks,
Mike

 

[memzilla]

Update:

i just cleaned the contacts between the body and the prism and I'm now getting proper meter readings.

Thanks to all who read my post.

 

[brucemuir]

well, glad to hear you sorted it out.
cleaning contacts is always my first try at a remedy for camera communication errors.

have fun with that great camera.