LensTip.com

Lens review

Sigma C 90 mm f/2.8 DG DN

8 November 2021
Maciej Latałło

10. Autofocus

The Sigma's 2.8/90 autofocus combined with the newer body of the Sony A7R IV is noiseless and quite quick. Running through the whole distance range and confirming the focus takes from 0.4 to 0.6 of a second and it doesn't seem to depend on the direction of the movement of the mechanism.

After attaching the lens to an older body, the Sony A7R III, we didn't notice any significant change – once again the performance was noiseless and quick. We think it was even a tad quicker in fact – the times, registered by us, more often than not kept the range from 0.4 to 0.5 of a second.

The accuracy of the autofocus can't be called outstanding. The percentage of misses for both bodies was the same, amounting to about 5-6%, a higher value than in case of system lenses used with the same camera bodies.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

We didn't notice any distinct front or back focus tendency.

A7R III, f/2.8
Sigma C 90 mm f/2.8 DG DN - Autofocus