Title: Warning for Nikon owners
Product review: I received this lens recently and tested it in the back yard and found it to be acceptably sharp in all corners. What I find unacceptable is that there is no MF/AF switch on the lens. According to the manual this is only for the Nikon-mount version of this lens. The manual suggests that you use the AF/MF switch on your camera body to turn the lens to manual focus, but at least some (possibly all) of the more recent Nikon APS-C cameras (including mine, a D3100) do not have this switch. This makes the lens almost unusable for someone who wants to set the focus, reframe the camera on a tripod, and take a photo. It also prevents me from shooting more than one photo at a time without loosening my ball head, autofocusing again, holding down the shutter while repositioning my camera again and then shooting another frame. Needless to say this makes shooting with this lens very impractical. It does look like the Sigma 10-20 3.5 has the switch, so that may be the direction to go.
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