Olympus Zuiko Digital ED 12-60 mm f/2.8-4.0 SWD
7. Coma and astigmatism
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The influence of coma on the circular diode picture can be observed the easiest in the frame corner at 60 mm. Undoubtedly it is one of the reasons of lowering the resolution at this particular focal length. At shorter lengths the coma is definitely less bothersome.
The case of astigmatism looks even better – it amounts to less than 4% which we consider to be a very good result.
