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Lens review

Sigma 120-300 mm f/2.8 APO EX DG OS HSM

2 August 2012
Szymon Starczewski

6. Distortion

Telephoto lenses of this quality usually have no problems with geometric deformations. The Sigma 120-300 mm OS is not an exception to this rule. On a small APS-C/DX sensor the distortion is almost not visible at all, amounting to 0.07%, 0.40% and 0.54% at 120, 200 and 300 mm respectively. After attaching the converter this aberration becomes more pronounced and its level reaches the highest value of 0.71%.

For obvious reasons we got higher results on full frame; still they are not something you should worry about. At the beginning, in the middle and at the end of the focal range you see slight pincushion distortion with the values respectively: 0.13%, 0.80% and 1.16%. Once again the highest level of this aberration (1.67%) the lens reaches when it cooperates with the original Sigma converter.

Nikon D3x, 120 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D3x, 200 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D3x, 300 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D3x, 420 mm (TC 1.4x)
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion

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Nikon D200, 120 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D200, 200 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D200, 300 mm
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion
Nikon D200, 420 mm (TC 1.4x)
Sigma 120-300 mm f/2.8 APO EX DG OS HSM - Distortion