Lens review

Sigma 105 mm f/2.8 EX DG Macro

4. Image resolution

When it comes to the image quality we can speak about the Sigma 2.8/105 very highly. Even at the maximum relative aperture the MTF50 function values reached 32.2 lpmm and we consider such a result to be very good. The results even improve because by f/4.0-5.6 we get the resolution exceeding a very high level of 38 lpmm.

At the frame edge the situation is not worse. An average lens gets typically 30 lpmm there. The Sigma reaches that level practically at the maximum aperture and on slight stopping down we see values ranging from 33 to 35 lpmm.

To sum up at all useful apertures we can get high quality images both in the frame centre and at the edge!