> magazine). Is this a result of different testing methods or does
> effective focal length vary from one specimen to another? Differences
> appear to be quite big.
This can be cecause of minor changes between two different versions of the same lens,
although there has never been a second version of the 28-70/2.8L (not according to the
on-line Canon Museum (wich is a great resource of info on old gear))...
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