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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 22 Jan 2012 (Sunday) 02:33
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16-35mm loose screw

 
psxindo
Senior Member
419 posts
Joined Mar 2007
Location: So Cal
     
Jan 22, 2012 02:33 |  #1

I just got home from a long wedding.

During the wedding, suddenly my 16-35mm focus ring was stuck. It would only move maybe 1 mm only. Auto focus is still working fine. Zoom is also fine.

After trouble shooting for a few minutes, I realize that the focus ring worked after I hold the camera upside down and start moving the focus ring again. But after I hold it right side up, the focus ring was stuck again.

After a couple more minutes of trouble shooting, I can feel a small bump under the rubber focus ring. Then I figured out that it must be something loose inside.

I manage to lift the rubber focus ring, and voila a loose screw.

Now I'm home and manage to tighten the screw.

My question is, How important is this crew? Does it affect the focus? I mean, should I bring my camera to Canon Service Center to fix it instead of fixing it myself (over tighten maybe)?

FYI: I noticed that there are 2 screws next to each other, 1 with a white plastic ring and the other without. The one that is loose in my lens is the one without the white ring.

Thanks


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phreeky
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Location: Australia
     
Jan 22, 2012 05:36 |  #2

If the lens appears fine after tightening it then I'd leave it at that. Obviously if you couldn't MF with it loose then it's important, but screws in locations such as just under the focusing ring are no what you'd expect to be used for things like calibration.




  
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Stan_Fox
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Location: Charleston, SC, USA
     
Jan 22, 2012 07:41 |  #3

In answer to your question, yes it is important. As you saw, it can lock up the lens and not allow focusing and can put a major strain on the motor & gears. The "white plastic" are glides that run in cams.
I've had the same thing happen in our 16-35, and by tightening (by snugging it down) it and keeping an eye on it, it should be fine. What ever you do, do not introduce any sort of thread locker on it!


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rick_reno
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Jan 22, 2012 10:08 |  #4

Keep and eye on it, and if it loosens again snug it up. For myself, taking it to Canon would depend on if it's under warranty or not.




  
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Ashclow
Hatchling
2 posts
Joined Sep 2012
     
Sep 30, 2012 09:10 as a reply to  @ rick_reno's post |  #5

Hi I am having the exact same problem with my 16-35, I can move the focusing ring when I turn it on its side and I can feel the bump underneath the rubber focusing ring which I presume is the screw. My question is how did you lift the rubber ring in order to tighten the screw. I am nervous to go messing around with it but if it is easy to do, I could save myself a fortune by not sending it to Canon.
Many thanks for any help you can offer :)




  
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SkipD
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Location: Southeastern WI, USA
     
Sep 30, 2012 09:18 |  #6

psxindo wrote in post #13746693 (external link)
I just got home from a long wedding.

During the wedding, suddenly my 16-35mm focus ring was stuck. It would only move maybe 1 mm only. Auto focus is still working fine. Zoom is also fine.

After trouble shooting for a few minutes, I realize that the focus ring worked after I hold the camera upside down and start moving the focus ring again. But after I hold it right side up, the focus ring was stuck again.

After a couple more minutes of trouble shooting, I can feel a small bump under the rubber focus ring. Then I figured out that it must be something loose inside.

I manage to lift the rubber focus ring, and voila a loose screw.

Now I'm home and manage to tighten the screw.

My question is, How important is this crew? Does it affect the focus? I mean, should I bring my camera to Canon Service Center to fix it instead of fixing it myself (over tighten maybe)?

FYI: I noticed that there are 2 screws next to each other, 1 with a white plastic ring and the other without. The one that is loose in my lens is the one without the white ring.

Thanks

Which version of the 16-35L do you own - the original version (77mm filter thread) or the MkII version (82mm filter thread)?


Skip Douglas
A few cameras and over 50 years behind them .....
..... but still learning all the time.

  
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Ashclow
Hatchling
2 posts
Joined Sep 2012
     
Oct 02, 2012 05:29 as a reply to  @ SkipD's post |  #7

I don't know about the op but I own the MK II with the 82mm thread. I have now managed to lift the rubber ring and tighten the screw so hopefully that means that I have sorted the problem :)




  
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matthew19
Hatchling
1 post
Likes: 1
Joined Apr 2014
     
Apr 28, 2014 10:54 |  #8

Your question helped me get through a day by turning the lens upside down. After a little more research I found a permanent fix. Its a loos screw inside the lens, heres how to fix : https://www.youtube.co​m/watch?v=yKixsWVvTsM (external link)




  
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TekHouse
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1,289 posts
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Joined Nov 2007
Location: Earth
     
Aug 15, 2014 13:38 |  #9

DO NOT put glue or thread lock when doing this fix!


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16-35mm loose screw
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