Tamron 20mm F/2.8 Di III OSD M1:2 Review

February 3, 2020 | Mark Goldstein |

Sharpness at 20mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Tamron 20mm F/2.8 Di III OSD M1:2 lens was attached to a Sony Alpha A7 III body, which in turn was mounted on a sturdy tripod. Self-timer mode was activated. Slight tonal changes are due to slight changes in natural light during the session.

The full frameThe full frame at 20mm

Center sharpness is excellent wide-open at f/2.8 and outstanding between f/4 and f/11. At f/16 sharpness is beginning to drop off slightly to diffraction.

Edge sharpness is not quite so good as at the centre, with peak performance between f/5.6-f/11.

Aperture Centre Crop Edge Crop
f/2.8 f2_8.jpg f2_8.jpg
f/4 f4.jpg f4.jpg
f/5.6 f5_6.jpg f5_6.jpg
f/8 f8.jpg f8.jpg
f/11 f11.jpg f11.jpg
f/16 f16.jpg f16.jpg
f/22 f22.jpg f22.jpg