Lens review
2010-01-29
Sigma 300 mm f/2.8 EX DG HSM APO
6. Distortion
Geometric deformations at the frame edge won’t be bothersome in any case. Before attaching the converter and afterwards the results, within the margin of error, fluctuate near zero. Average measurement results are 0.14% and -0.17% respectively so the values imperceptible in practice.
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