Quote:
Originally Posted by brightmatter
I've researched it and the d5100 does NOT have an internal focus motor so the lens will not be fully functional. Besides, the D5100 is much more expensive considering the difference between the two.
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You are right the d5100 does not have the focus motor. The 17-70mm has the hyper silent motor so it will focus on the d40/60/3000/3100/5100.