я согласен и за деньги устранить, либо продать тушку...

вот еще нашел:

"The Elan 7/30 does not support stop-down metering for manual lenses. Previous EOS cameras let you attach manual focus lenses through special lens mount adapters, but the Elan 7/30 does not meter correctly when a manual lens is installed - it apparently meters about 3 stops out. So you have to compensate for this yourself when shooting. Note that I say “apparently” since I’ve heard conflicting reports as to whether the camera metering error is linear or not. A non-linear error is obviously much more difficult to compensate for.
I have no idea whether this design flaw was due to obscure technical reasons (maybe entry angle of light in the metering system, affected by the presence of ECF or diopter adjustment?) or whether Canon marketing decided it’d be a good idea to lock camera buyers into using EF-compatible lenses only, but either way it’s frustrating for those of us who like to use manual lenses from time to time. I can understand a limitation like this being built into low-end consumer models, but come on! This camera is sold as the perfect advanced amateur camera. And advanced amateurs are the most likely crowd of people to want to use manual-focus lenses. Certainly more likely than either beginners or professionals."
http://photonotes.org/reviews/eos-elan-7/

то что ошибка нелинейная - это совсем как-то расстраивает :(