The 85 mm class lenses usually don’t experience any distortion problems; still the Zeiss Otus, tested here, showed it can be reduced to practically a zero level. On a small APS-C sensor that aberration amounted to just +0.06% and on full frame it was –0.04%. Don’t be surprised both these values have a different sign. Taking into account the fact that our distortion measurement error is about 0.1-0.2% we can safely say that these two results are in perfect accordance with our previous ‘almost zero-level distortion’ statement.
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