Sigma 50-100mm F/1.8 DC HSM Art Review
Sharpness at 70mm
For this test, the Sigma 50-100mm F/1.8 DC HSM Art lens was attached to a Canon EOS 80D 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 70mm
Centre-frame sharpness at all apertures at 50mm is impressive. If you examine at 100% in the crops, you’ll see that f/16 is a little less sharp than the others, due to diffraction. Corner sharpness is softer than the centre of the frame at the wide apertures of f/1.8-f/4. After this, the difference between the centre and the corner is less marked.
At 100mm, centre sharpness is a little softer at the widest apertures of f/1.8, f/2.0 and f/2.8. It gets increasingly sharper until f/11, where it becomes a little softer again once it hits f/16. Corner sharpness is again softer than the centre of the frame at wide apertures f/1.8-f/4.0. At f/5.6 through to f/16 the difference between the centre and the corner is less marked.
Overall the impression of sharpness when looking at images at normal printing or viewing sizes is very good.
|Aperture||Centre Crop||Edge Crop|