LensTip.com

Lens review

Sigma 10-20 mm f/3.5 EX DC HSM

25 September 2009
Arkadiusz Olech

10. Autofocus

A lens of 10-20 mm focal lengths gives pictures of such a large depth of field that we can often do without the autofocus. For instance, at 10 mm even at the maximum aperture, setting the distance scale at 1.5 meters we get an image sharp from 0.8 meters to infinity.

However, Sigma decided to equip their lens in a silent HSM motor. It does, in fact, work noiselessly and very fast, as going through all the scale takes it less than 0.5 second, no matter the direction.

The combination of a good HSM mechanism and short focal lengths giving a large depth of field resulted in no problems with the autofocus at all. The amount of mistakes in studio conditions reached 1%, which is a slight value. There was no tendency of front- or back-focusing. What’s interesting, Sigma mounted on Nikon D200 performed better than Nikkor 10-24, which with the same camera body showed large front-focus.


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

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


Sigma 10-20 mm f/3.5 EX DC HSM - Autofocus