Thanks to all for your input.
So, it appears to be a systematic problem with wide lenses and spot
meter. I still do not quite understand why the two cameras I tested
behaved differently (the center-weighted and spot reading in my
OM4Ti/2-13 weere identical, but not in OM4/2-4). But, could be.
Vignetting could be a reason for the observed behaviour, but one
fStop difference between center-weighted and Spot reading seems a bit
too much vignetting (I did my test at f5.6).
Be it as it is, question is, can I use the Spot meter with wide angle
lenses at all, do I have to compensate?
Gruesse, thomas
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