http://www.nikonchat.com/nikon-autofocus-problem/

Is this an autofocus lens with my Nikon D40?
I'm buying a telephoto lens for my new Nikon D40. Did not realize there were problems compatibility when it comes to new lens and autofocus. I think this auto focus lens with my camera, but can not find a clear "yes, be! "anywhere. Could someone give me the signal? I was told that since it has AF-S, which means will, but I'm not positive. http://www.nikonusa.com/Find-Your-Nikon/ Product/Camera-Lenses/2166/AF-S-DX-VR-Zoom- -NIKKOR 55-200mm-f%-5.6G-IF-252F4 ED.html Thank you! THANK YOU!
Yes, absolutely, without doubt, positively work with the D40. It has a focus motor incorporated into the lens, so that does not depend on an engine body approach (which is what lacks the D40).
Sigma 30 1.4 test autofocus