Olympus Zuiko Digital ED 70-300 mm f/4.0-5.6
7. Coma and astigmatism
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The much-praised frame edge performance of the Olympus allows us to think that off-axis aberrations won’t be a huge problem. It is actually the case. The coma is well-corrected and the diode image in the frame corner - practically deformation-free.
Equally favourable situation can be observed in the case of astigmatism. The average result between horizontal and vertical MTF50 function values amounts to 6% which is a good result.
