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Anonymous File :-(, x)
>>180763 Most, if not all 40/45mm pancakes are very sharp since they're based on the same straight-focus Zeiss designs refined over time. The 45/2.8 Nikkor, for instance, is a carbon copy of the earlier C/Y mount 45/2.8 Tessar, and>>180771is derived from the early 50/3.5 Elmar, which, in turn, again was based on a Tessar design.
The 25/2.8 Zuiko, however, is a very different beast since it's a completely new retrofocus design with complex aspherical lenses, and while it's reported to be sharp, it also suffers from chromatic aberrations typical for retrofocus lenses. The reason why there are so little info on it yet is Olympus' gross miscalculation of demand; it's hard to get even in Japan.
picture mildly related
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