Sony Carl Zeiss Vario-Sonnar T* DT 16-80 mm f/3.5-4.5
6. Distortion
Zeiss fares much better - at the widest angle, the distortion is –3.9% barrel. It’s still a lot and the result is the same as in the cheaper Sigma 17-70 mm, although Sigma had it easier because of the narrower focal length range.
Fortunately when the focal length rises we get rid of distortion almost completely. At 30 mm it’s almost zero (0.16%) within measurement errors accuracy; at 50 and 80 mm it increases a bit but it keeps the same 0.64% level.
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