Somewhat disappointed with Sigma 16mm F1.4 Locked

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AHM Contributing Member • Posts: 602
Somewhat disappointed with Sigma 16mm F1.4

It seems to me the lens is not very sharp at large apertures. I did the following experiment: I took one pictures at F2.8 which gave ISO 640 and then another at F1.7 which gave ISO 250. The pictures look identical. The first is noisy, so lacks fine detail. But the second did not improve anything. It lacks just as much detail, which seems to be because the lens lacks sharpness. So, I gained nothing by using a larger aperture.

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