Sigma 17-70mm F2.8-4 DC Macro OS HSM C Review

March 13, 2014 | Mark Goldstein | |

Sharpness at 50mm

For this test, the Sigma 18-50mm F1.8 DC HSM lens was attached to a Canon EOS 70D body, which in turn was mounted on a sturdy tripod. Exposure delay mode was activated. Tonal and colour variances across the crops are due to changes in natural light during the session.

The full frame at 50mmThe full frame at 50mm

Centre sharpness is high through from f/5.6 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the centre, with f/8-11 producing the sharpest results.

Aperture Centre Crop Edge Crop
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