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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Nov 2014 (Sunday) 10:06
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Canon 15-85mm Lens Repair/Dissasembly, pics & additional input please...

 
Ralph ­ III
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Nov 09, 2014 10:06 |  #1

Hello All,

INRE: Canon 15-85mm focus repair, lens creep inquiry...

Hello All,
A few weeks ago my 15-85mm began having a focusing issue. Whereas if the lens was sitting idle for a period of time; upon going to use it, it would take 8-10 seconds for the focus to begin working. After this initial period the focus would then "engage" and the lens would function as normal. This was the case in manual as well. In manual, you would have to turn the focus ring back and forth five or six times before it would finally "catch" and then begin focusing normally.

ISSUE & SOLUTION: I took the lens apart and discovered the "silver" retaining ring had turned and consequently wasn't applying as much pressure on the tensioning ring under it. The retaining ring slips into a plastic housing slot, you then turn it clockwise to lock it in. The plastic housing has a slant under it, so the retaining ring is compressed more and more the further you turn it. Note: It reaches its' stopping point about 1/8 of a turn...

Anyhow, my ring had worked itself counter clockwise (over the years apparently) which caused it not to apply intended pressure on the tensioning spring. This is repaired by simply turning the ring back to its' intended position. I will apply a dab of caulking, as it appears Canon did originally, on the ring to keep it from working lose again.


QUESTION: My lens suffers from the typical lens creep. I noticed if I remove six black screws the zoom ring assembly then wants to come off. Is it possible to fix the zoom creep via this method? I am hesitant to remove this assembly without some input but figured I may address it since the lens is apart at the moment....

Ralph


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Ralph ­ III
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Nov 09, 2014 10:06 |  #2

I will clean all of this up in the next day or so but wanted to go ahead and upload some images. I will upload an entire "assembly/disassembly" if you folks desire such and if such will be of use?


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Ralph ­ III
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Nov 09, 2014 10:08 as a reply to  @ Ralph III's post |  #3

I'll add some more details as soon as possible with this post


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Ralph ­ III
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Nov 09, 2014 10:12 as a reply to  @ Ralph III's post |  #4

reserved for more images


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Ralph ­ III
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Nov 09, 2014 10:13 as a reply to  @ Ralph III's post |  #5

reserved for anticipated last images. Please give some input if you have any.


Thanks,
Ralph


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Mobaz
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Sep 07, 2015 02:46 |  #6

Hey, I bought a used lens and noticed this same focus issue with my 15-85mm. Did this solution of turning the ring work. And is the disassembly of the lens similar to the 17-85mm?




  
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Ralph ­ III
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Sep 14, 2015 17:57 as a reply to  @ Mobaz's post |  #7

I don't know about the 17-85mm but the disassembly was pretty smooth. Yes, turning the ring back to its original position fixed the issue.

Ralph


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PineBomb
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Sep 14, 2015 18:27 |  #8

I have nothing helpful to add. I just wanted to subscribe. ;-)a


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Canon 15-85mm Lens Repair/Dissasembly, pics & additional input please...
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