Panasonic Leica DG Summilux 15 mm f/1.7 ASPH
7. Coma, astigmatism and bokeh
The next flaw which limits the resolution a bit is astigmatism – its value we determined as 9%. It is not a high level but you also can’t speak about a perfect correction of that aberration either.
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Defocused light points look nice for a change – the light is spread evenly and onion rings are barely noticeable. The vignetting, though, makes itself felt; despite using a small Micro 4/3 sensor and stopping down the lens the images in the corners are still truncated.
