Question about Sigma 70-300mm f/4-5.6 DG Lens

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Sigma 70-300 lens will not move in auto mode. makes loud motor running sound, and gets to a certain point and stops, but the motor keeps running. I can move it fin in manual mode.

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It's almost certainly got a stripped drive gear. This is not a DIY repair, but if the rest of the lens is in excellent condition and not more than around five years old then it's probably cost effective to get it repaired. Sigma are normally excellent at supplying spare parts for their lenses.

Get an estimate for the work from a photographic repair specialist but be prepared for at least a four to six week turnaround time as that's what I'm currently finding for good repair outlets on both sides of the Atlantic.

Posted on Jul 19, 2009

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Posted on Jan 02, 2017

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IN AUTO FOCUS FOCUS RING STICKS MAKES NOISE LIKE


How new is the lens? In or out of warranty? If out or warranty most likely solution is to find a Sigma authorized repair shop because your description sounds like the auto-focus motor gear has failed. If in warranty, check out Sigmaphoto.com for repair sites and also download the SIGMA_SERVICE_REQUEST.PDF. I've only had to deal with Sigma once on warranty matter and they were very helpful, provided UPS authorization for shipping on their nickel.

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My lens is not getting the image sharp and the motor of the lens is making a strange noise.


The autofocus motors in Sigma lenses that are not HSM tend to be noisy, but I presume yours is now more noisy than usual. With that, and not focusing properly, considered together, It seems to me the motor has failed or the lens parts have partially seized causing the motor to "struggle" to focus parts that are not moving as they should. I.e., once focused the motor will stop, but if the electronics are telling the motor the lens is not if focus, it will continue to try to achieve focus. Most likely, time for repair, and if in warranty, contact Sigma repair via Sigmaphoto.com.

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Hi is the manual focus working from inf to close focus and not stoping then it needs a new hsm motor

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Found this myself check manual focus ring (closest to camera) maybe ring has moved to "manual"position. This ring moves backwards and forwards between "manual" and "auto" and may need pushing home completely

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