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<blockquote data-quote="WeeHector" data-source="post: 236485" data-attributes="member: 14301">Jai1989: AF-S is a Nikon designation and doesn't necessarily apply to 3rd party lenses. Thus, my Sigma 70-300 is a DG Macro but still has a built-in motor. Even the description on Amazon was very unclear and I wasn't sure it would work in AF until I received it.chili: What does he use the lens for? Is he photographing and videoing similar scenes? If he has been using the lens for macro photos then it may not be able to focus on longer distance video. If it is like the Sigma (and I suppose it is) check if focusing is on the macro scale. If it is, set the lens to MF, turn the focus ring to infinity, reset Macro to Normal and then turn on AF. If this is not the problem then go into the menu and check the Live View/movie setting in AF-area mode. If it is set to face priority then try it out in one of the other modes.I'm stabbing a bit in the dark as I haven't really used mine much for movies. I'd love to know if this is a help or not. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="WeeHector, post: 236485, member: 14301"] Jai1989: AF-S is a Nikon designation and doesn't necessarily apply to 3rd party lenses. Thus, my Sigma 70-300 is a DG Macro but still has a built-in motor. Even the description on Amazon was very unclear and I wasn't sure it would work in AF until I received it. chili: What does he use the lens for? Is he photographing and videoing similar scenes? If he has been using the lens for macro photos then it may not be able to focus on longer distance video. If it is like the Sigma (and I suppose it is) check if focusing is on the macro scale. If it is, set the lens to MF, turn the focus ring to infinity, reset Macro to Normal and then turn on AF. If this is not the problem then go into the menu and check the Live View/movie setting in AF-area mode. If it is set to face priority then try it out in one of the other modes. I'm stabbing a bit in the dark as I haven't really used mine much for movies. I'd love to know if this is a help or not. :) [/QUOTE]

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