Originally posted by Medex I have "adapted" Revuenon 55/1.2 (M-->A) and metering with this lens is wrong about +2/3 stops in f1.4-8 range but the error is constant (pictures are looking equally exposed in this range; I did not try f8+ apertures, because I don't use them). So exposure compensation -2/3 eV helps if you need correct/good exposure. In case of underexposure there is no problem to make adjustments in postprocessing.
This makes no sense, wide open should be perfect if. You coded both min and max aperture values.