I have already sent my Sigma lens for the replacement of the focus ring before. So when the new ring broke after 1 more year of usage I decided not to waste money any more and to try to fix it by myself.

Put the lens on the table the way you can access the buttom screws.
  • Put the lens on the table the way you can access the buttom screws.

  • Unscrew the black screws near the contact plate and from the black inner ring (which stands between the optical lens and the top outer ring).

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Remove the inner ring.
  • Remove the inner ring.

  • Unscrew the screw from the top outer ring.

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  • Remove the top outer ring.

  • Remove the little shaft with the focus gear and the multiple rings that hols the shaft.

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  • Unscrew the screws that hold the top plastic ring (which is part of the lens body) and remove it.

  • Unscrew the screws that hols microchip plate.

  • Unscrew the screws that attach lens outer body part to the inner optical part.

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  • Now you should be extra aware and do the next operation very carefully!

  • Remove the inner optical part from the outer body part of the lens.

  • Try to memorize the way the parts were inserted one into another (when assembilng the lens I have lost a lot of time figuring out how the optical part should be fitted into the outer body part).

  • Put the optical part away very carefully without putting it upside down.


At this point you need to loosen/ of remove the screw that allows the zoom ring to turn so the lug seen on the ring meets the slot allowing it to be removed

Daniel Wright - Réponse

  • Remove the zoom ring.

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  • Unscrew the screw which were hiding under the zoom ring (see right part of this picture).

  • Remove the top part from the fosing ring (focusing ring is on the left part of this image).

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  • Now you can clearly see the reason of the problem.

  • If tou are not sure you can accomplish the further repair steps you order a replacement focus ring and reassemble the lens in the reverse order.

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  • Take the stapple block and detach some stapples from it (I actually used 2 of them)

  • Cut one stapple leg away from the stapples.

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  • Use a dremmel tool to remove the broken cog (I have removed 2 of them).

  • Use a small flathead screwdriver to make 2 small grooves on the flat surface of a ring right behind the removed cogs have been placed.

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  • Use a soldering iron to solder the previously prapared stapples into the focus ring.

  • Put some super glue over the soldered stapples.

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To reassemble your device, follow these instructions in reverse order.

6 autre(s) ont terminé cette réparation.


Membre depuis le 03/07/2014

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1 tutoriel rédigé

I dismounted the lens to make the repair and unintentionally I DISASSAMBLE THE OPTICAL PART and now I can not ride back. chaos

Ricardo Morais - Réponse

Thank you so much for posting this.

It helped me to fix my focus ring. In my case the teeth on the ring were not damaged, but a small piece of some broken plastic was blocking the ring from moving smoothly.


Shlomsi - Réponse

I am very thankful to You, as just repaired my Sigma by this method.

Thank You very much!

egidijus1972 - Réponse

I have a Sigma DG 70-300 zoom. Problem: zoom part comes all the way out and will not go back in and lock in place . Can it be fixed? John polley

John Polley - Réponse

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