Pentax smc D FA 100 mm f/2.8 Macro WR
7. Coma and astigmatism
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The tested lens corrects coma very well. In the corners of the APS-C sensor there are practically no problems whatsoever – you can see it very well in these photos.
When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, it amounted to 7% which is low. If we take a closer look at this aberration we can notice it makes itself really felt only at the maximum relative aperture. On stopping down the aperture it disappears very swiftly so by f/4.0 it is already imperceptible.
