Sony 35 mm f/1.4G
7. Coma and astigmatism
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The following excerpts of the diode picture, respectively from the A100 and A900 frame centre and from the frame corner show that coma can degenerate the picture significantly on the fringe. It is especially clear on A900 where a point diode is changed into a quite significant comma, which has big dimensions even on stopping down by one stop.
Fortunately the astigmatism is well-controlled and deteriorates the picture only slightly. It’s level reaches “low” and “very low” borderline with the result a bit over 6%.
