Repairing Focus Ring On Sigma 70 300Mm F4 5 6 Dg Macro For Sony Repair Guide

Difficulty

Difficult

Steps

Time Required

                          2 hours

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Repairing Focus ring on Sigma 70-300mm F4-5.6 DG Macro for Sony
11 steps

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BackSigma 70-300mm F4-5.6 DG Macro for Sony
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Introduction

What you need

Step 1

              Repairing Focus ring on Sigma 70-300mm F4-5.6 DG Macro for Sony

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).

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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Step 2

Remove the inner ring.
Unscrew the screw from the top outer ring.

Remove the inner ring.

Unscrew the screw from the top outer ring.

Step 3

Remove the top outer ring.
Remove the little shaft with the focus gear and the multiple rings that hols the shaft.

Remove the top outer ring.

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

Step 4

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.

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.

Step 5

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.
DO NOT TRY TO DISASSAMBLE THE OPTICAL PART.

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.

DO NOT TRY TO DISASSAMBLE THE OPTICAL PART.

Step 6

Remove the zoom ring.

Remove the zoom ring.

Step 7

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).

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).

Step 8

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.

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.

Step 9

Take the stapple block and detach some stapples from it (I actually used 2 of them)
Cut one stapple leg away from the stapples.

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

Cut one stapple leg away from the stapples.

Step 10

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.

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.

Step 11

Use a soldering iron to solder the previously prapared stapples into the focus ring.
Put some super glue over the soldered stapples.

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

Put some super glue over the soldered stapples.

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

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                                                                                      8 other people completed this guide.

Author

                                      with 2 other contributors

                    Pavel

Member since: 07/03/2014

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Ricardo Morais - Aug 13, 2015

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

Shlomsi - Nov 29, 2016

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.

Thanks!

egidijus1972 - Dec 1, 2016

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

Thank You very much!

John Polley - Apr 15, 2018

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

Member-Contributed Guide#

Introduction#

What you need#

Member-Contributed Guide

Introduction

What you need