Auto focus with wide angle lens?
My camera body is nikon d3100 and I'm shopping for an affordable wide angle lens for landscape shots. I'm considering the sigma 10-20 mm, but someone told me that it will not auto focus with my camera body. Is this true? Is there a similar alternative (same image quality) which will allow me to use AF? Any other lens suggestions in this regard?
The Sigma 10-20mm will autofocus on your camera - it has HSM (as far as i know there's no version without HSM) and thus it brings its own autofocus motor.
That being said, autofocus is not really important for ultra wide angle lenses due to their naturally extremely deep depth of field.
Other alternatives would be:
Nikkor 10-24mm AF-S (will autofocus)
Tokina 11-16mm (no autofocus)
Tokina 12-24mm (no autofocus)
Tamron 10-24mm (i don't know)
All of Sigma's wide angle offerings are now HSM and will autofocus: http://www.sigmaphoto.com/...oom-lenses
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