Introduction

This guide shows how to disassemble a complicated (but cheap) SLR lens, and hopefully reassemble it in working order. Please note that this is a fiddly and complicated procedure; if you value your lens and definitely need it to work, service it. I purchased an "untested" camera from eBay that had obviously been drop tested.

Image 1/1:
  • First, remove the two screws in the barrel of the lens with a philips 0 screwdriver

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Image 1/1:
  • Next, remove the four screws holding the rear cover of the lens on

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Image 1/1: Note the piece of plastic that just fell out. Not a good sign!
  • Remove the rear cover, and then remove the rubber seal (shown in place around the edge of the lens in this picture).

  • Note the piece of plastic that just fell out. Not a good sign!

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Image 1/1:
  • Gently lift and remove the plastic barrel next to the focus switch. My one was already cracked.

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Image 1/1: Watch out for the autofocus mechanism and control wires. They are very delicate.
  • Gently manipulate and remove the AF/M focus switch - it is held in by four easily breakable brittle plastic clips.

  • Watch out for the autofocus mechanism and control wires. They are very delicate.

  • It's a good idea to switch the lens to manual at this point - adjusting the focus can help when removing the autofocus motor

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Image 1/1: Do not remove them by pulling the sticking out plastic parts (one is obscured by my finger here) - these will tear off
  • Remove the top two control wires by releasing the clamps, and then gently easing the wires from the connectors

  • Do not remove them by pulling the sticking out plastic parts (one is obscured by my finger here) - these will tear off

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Image 1/2: Mind the cable underneath the board Image 2/2: Make sure you don't touch the lens element in the centre!
  • Gently lever the control board out from under the plastic tabs

  • Mind the cable underneath the board

  • Make sure you don't touch the lens element in the centre!

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Image 1/1: Then, remove the control board entirely
  • Lift up the board, and then gently pull the lower connector out by the solid connector

  • Then, remove the control board entirely

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Image 1/2: Remove the two screws shown Image 2/2: Be careful with the control cables. They tear easily. The aperture control cable on this lens is damaged already.
  • Next, we will remove the autofocus mechanism

  • Remove the two screws shown

  • Be careful with the control cables. They tear easily. The aperture control cable on this lens is damaged already.

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Image 1/1: It's best to have the focusing mechanism in manual (M) - then extending the lens will help you remove the mechanism
  • Lift off the focusing mechanism.

  • It's best to have the focusing mechanism in manual (M) - then extending the lens will help you remove the mechanism

  • Remove the ringed screw and lift out the metal guide.

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Image 1/2: Image 2/2:
  • Remove the screws holding the rear element and aperture in place.

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Image 1/1: This will lift the rear element and aperture unit towards the rear of the lens, and align the three legs with gaps
  • Gently turn the zoom so it is nearly at 35mm

  • This will lift the rear element and aperture unit towards the rear of the lens, and align the three legs with gaps

  • Lift the rear element and aperture unit out

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Image 1/1: On my lens, there was one of the three legs intact, and the aperture unit was hanging off uselessly.
  • Gently rotate the aperture unit anti-clockwise so that the three ringed legs no longer lock it in place.

  • On my lens, there was one of the three legs intact, and the aperture unit was hanging off uselessly.

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Image 1/1: Don't get any on the glass!
  • If your aperture unit is like mine, apply superglue around the outer rim, and replace

  • Don't get any on the glass!

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Image 1/1: The aperture unit/rear element is slightly tricky to put back. Make sure you align it correctly (lens nearly at 35 mm, so that the screw holes are high up).
  • That's as far as I went - the zoom was no longer jammed, and reassembly was the best option here! Reassembly is the reverse of disassembly

  • The aperture unit/rear element is slightly tricky to put back. Make sure you align it correctly (lens nearly at 35 mm, so that the screw holes are high up).

  • Remember to blow dust out of the lens if you see any as you are reassembling it. Do not use anything liquid to clean the inside of the lens unless you know what you are doing.

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Image 1/1: That slightly torn aperture cable did not affect operation of the lens. It works perfectly.
  • Put the random bits of plastic in your man (or woman) drawer. Who knows when they will come in handy?? But seriously, here's what I found:

  • That slightly torn aperture cable did not affect operation of the lens. It works perfectly.

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Image 1/1: Don't think you can get away without those tiny screws in the barrel. They hold the contacts in place. I tried and focusing did not work!
  • Completely reassemble the lens and test on your SLR/D-SLR. Now you can take badly exposed shaky indoor shots like the one shown again!

  • Don't think you can get away without those tiny screws in the barrel. They hold the contacts in place. I tried and focusing did not work!

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Conclusion

Complete disassembly and some super glue fixed my lens, but not everyone will be so lucky.

9 other people completed this guide.

Josh Watson

Member since: 11/28/2011

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