Sigma A 24-105 mm f/4 DG OS HSM review - Distortion

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Sigma A 24-105 mm f/4 DG OS HSM

14 November 2013

Arkadiusz Olech

6. Distortion

The chart below shows the distortion performance for particular focal lengths and detectors.

	24 mm	35 mm	50 mm	70 mm	105 mm
APS-C/DX	−2.27%	-0.06%	0.70%	0.77%	0.78%
FF	−4.96%	-0.17%	1.53%	1.65%	1.78%

It’s clear that at 24 mm you deal with barrel distortion: its level is high on full frame and moderate on the APS-C/DX sensor. On full frame you can even find some moustache distortion as well – the measurements for the frame centre provide a result of -5.3%, on average -4.6% across the frame. Near 35 mm focal length the distortion becomes zero and then it changes the sign. At longer focal length and on the APS-C/DX sensor the distortion level is imperceptible, becoming slight on full frame.

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Here the Sigma compares favourably with its rivals. The Nikkor 24-120 mm VR had a very similar distortion at 24 mm but its results at the longer end were worse than those of the Sigma. The Canon 24-105L was tested only on the smaller sensor but its results at the shortest focal length were a tad worse than those the Sigma got on a similar sensor. At the longer focal lengths the results of both lenses are, within the margin of error, the same.