DFA100 @f2.8 iso200, 1/250s, k5iis, no cropping, shot in raw and 'zeroed' preset in LR5 for a baseline:
The fringing is extreme on high contrast edges and wide open. It diminishes as either of these conditions lessen. I've learned to avoid these situations where possible, but when it isn't it can be tedious to protect other colour information while correcting for it. I understand it to be Axial Chromatic Aberrations, caused by different wavelengths of light focusing on different planes. Aberration gurus please correct me if I'm wrong
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I accept it as a compromise of size and cost of the dfa100mm. I'm hoping with pentax's recent releases of super awesome performance no compromise lenses that a highly corrected macro will eventually turn up (and that I can afford it by the time it does
). However, the only reason I would part with my dfa100mm is probably for a dfa100mm wr, I cannot imagine being without the option of its tiny size.