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Message: <blockquote data-quote="chili" data-source="post: 236471" data-attributes="member: 18899"> <table style='width: 100%'><tr><td></td><td>             Hi 1st post so please be gentle with me. i am asking this on behalf of my 17yr old son. He has a NIkon d3100 camera and the lens that came with it (nikon dx  af-s nikkor 18-55mm 1:35-5.6G) anyway he is studying media at school and has recently purchased a 2nd hand Tamron Zoom Lens AF 70-300mm 1:4-5.6 which he is generally happy with however he has noticed that it does not "auto focus" when his camera is in video mode. when his camera is in picture mode ie take a snap shot the lens will auto focus (wind itself in or out) and focus on the subject, when he switches the camera over to video mode the lens will make a very fractional twitch but will not auto focus. My son has 2 other friends studying media 1 has the same lens the other has the same camera, he tells me that his friend's lens will auto focus on his other friend's camera. My son has not been able to try the other lens on his camera yet <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /> the stock lens above in brackets does auto focus in both picture and video mode. my answer was that the lens may not have a motor to do the auto focus thing but my son countered this with how does it do it in picture mode then? unfortunatly i am not technically able to answer his question or even tell him if his lens is partially not working or is working as it is supposed to be. any help greatly appreciated, i hope the above is not too confusing many thanks and merry xmas </td></tr></table></blockquote>

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