D40 question.

im pretty sure the drive motor on that (for the auto focus) needs to be driven by the camera. And i am also pretty sure the D40 doesn't have that feature. So it will prob only work manually. I would do more thorough research at http://www.kenrockwell.com/ if i were you
 
There is no drive motor on that because it's a manual lens, and wont have autofocus feature anyway.
 
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