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<blockquote data-quote="nickt" data-source="post: 236487" data-attributes="member: 4923">If the lens autofocuses for the still shots, it has the motor. To be doubly sure look up the exact model manufacturer number. There are a few variations of 70-300. I'm guessing you might have this one:&nbsp; AF017NII-700 which does autofocus on the d3100.I never do video, but I have played with it for brief moments. I think the autofocus in video mode is a bit quirky. I don't have the camera in from of me to play with, but look closely into the various focus modes for video and see what you can find. Someone here should be more familiar with it than me, but I recall trying in my early days on the d3100 thinking it was broke and did not autofocus. It turned out to be my expectations. Bottom line though is if it focuses for a still, the lens has the motor and it will do its think in video mode. If you hold the shutter button half down in video mode, does it attempt to focus?</blockquote>

[QUOTE="nickt, post: 236487, member: 4923"] If the lens autofocuses for the still shots, it has the motor. To be doubly sure look up the exact model manufacturer number. There are a few variations of 70-300. I'm guessing you might have this one: AF017NII-700 which does autofocus on the d3100. I never do video, but I have played with it for brief moments. I think the autofocus in video mode is a bit quirky. I don't have the camera in from of me to play with, but look closely into the various focus modes for video and see what you can find. Someone here should be more familiar with it than me, but I recall trying in my early days on the d3100 thinking it was broke and did not autofocus. It turned out to be my expectations. Bottom line though is if it focuses for a still, the lens has the motor and it will do its think in video mode. If you hold the shutter button half down in video mode, does it attempt to focus? [/QUOTE]

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