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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Oct 2016 (Saturday) 17:33
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HELP! Canon EF 28-135mm Problems

 
Photoandglass
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Oct 29, 2016 17:33 |  #1

I just purchased this lens on POTN, and it was not disclosed that it was not mechanically 100% functional.

After doing some self diagnostics on the problems, it appears the lens is not communicating the focal length to the camera. I tested this by taking 5 shots all at different lengths. The metadata, once brought in to the computer shows the focal length at 135mm always.

Problems this creates:

Aperture will not go below F5.6 (As it should go to f3.5)
Focusing while in the widest focal length is poor.
Cannot go from Close focus to far.

Is there an easy fix that i am unaware of? any tips would be greatly appreciated.


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JeffreyG
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Oct 29, 2016 19:54 |  #2

To me the fix is to return the lens to the seller and tell them that the lens is not working as advertised. Unless this flaw was disclosed, you did not get what you paid for.


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mwsilver
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Oct 29, 2016 21:36 |  #3

Photoandglass wrote in post #18170564 (external link)
I just purchased this lens on POTN, and it was not disclosed that it was not mechanically 100% functional.

After doing some self diagnostics on the problems, it appears the lens is not communicating the focal length to the camera. I tested this by taking 5 shots all at different lengths. The metadata, once brought in to the computer shows the focal length at 135mm always.

Problems this creates:

Aperture will not go below F5.6 (As it should go to f3.5)
Focusing while in the widest focal length is poor.
Cannot go from Close focus to far.

Is there an easy fix that i am unaware of? any tips would be greatly appreciated.

Shouldn't you be talking to the person who sold it to you rather than us?


Mark
Canon 7D2, 60D, T3i, T2i, Sigma 18-35 f/1.8, 30 f/1.4. Canon EF 70-200 L f/4 IS, EF 35 f/2 IS, EFs 10-18 STM, EFs 15-85, EFs 18-200, EF 50 f/1.8 STM, Tamron 18-270 PZD, B+W MRC CPL, Canon 320EX, Vanguard Alta Pro 254CT & SBH 250 head. RODE Stereo Videomic Pro, DXO PhotoLab, Elements 15

  
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ebiggs
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Oct 30, 2016 02:19 |  #4

It does need to be returned unless you were told before hand. This lens is not a good candidate for repair. It would not be cost effective. :-(


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Photoandglass
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Oct 30, 2016 08:32 |  #5

Yes, I have sent them a message, just waiting to hear back. I was hoping that there was a fix out there for this. Everything else seems to be working fine.


Photo & Glass
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Canon •|• 7D...
Canon •|• 18-55mm IS ii & Canon •|• 85mm f1.8
--------- --------- ---------
Olympus •|• E-PL7...

  
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n1as
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Nov 02, 2016 14:22 |  #6

I doubt this will work, but perhaps:

1. Clean the contacts on the lens. Pencil eraser, Q-tip. Something like that.
2. Zoom to 28mm then try to set aperture to f/3.5. Does that work?


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ebiggs
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Nov 03, 2016 09:20 |  #7

n1as wrote in post #18173977 (external link)
I doubt this will work, but perhaps:

1. Clean the contacts on the lens. Pencil eraser,

Pencil eraser? NEVER, never. :-(


G1x, EOS 1Dx, EOS 1D Mk IV, ef 8-15mm f4L,
ef 16-35mm f2.8L II, ef 24-70mm f2.8L II, ef 70-200mm f/2.8L IS II,
Sigma 150-600mm f5-6.3 DG OS HSM Sport
*** PS 6, ACR 9.3, Lightroom 6.5 ***

  
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Photoandglass
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Nov 03, 2016 14:29 |  #8

The contacts are squeaky clean. Used a contact cleaning solution and lint free swab.. I am guessing it is an internal issue. i Also notice a sticking point right around 90mm when zooming in or out.


Photo & Glass
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Canon •|• 7D...
Canon •|• 18-55mm IS ii & Canon •|• 85mm f1.8
--------- --------- ---------
Olympus •|• E-PL7...

  
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runninmann
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Nov 03, 2016 16:26 |  #9

I see you have it for sale for parts now. How did you fare with the seller?


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Photoandglass
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Nov 03, 2016 16:29 as a reply to  @ runninmann's post |  #10

Partial refund.. I also have it on ebay.


Photo & Glass
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Canon •|• 18-55mm IS ii & Canon •|• 85mm f1.8
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Olympus •|• E-PL7...

  
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johnf3f
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Nov 03, 2016 19:04 |  #11

ebiggs wrote in post #18174609 (external link)
Pencil eraser? NEVER, never. :-(

I have often heard erasers recommended to clean contacts - but have never used one!

Is the problem that they may be too abrasive? Generate debris?

I haven't needed to clean contacts yet (thankfully) just interested in case I do in the future.


Life is for living, cameras are to capture it (one day I will learn how!).

  
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runninmann
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Nov 04, 2016 05:45 |  #12

johnf3f wrote in post #18175157 (external link)
I have often heard erasers recommended to clean contacts - but have never used one!

Is the problem that they may be too abrasive? Generate debris?

I haven't needed to clean contacts yet (thankfully) just interested in case I do in the future.

Yep. Those "crumbs" could end up in undesirable places.


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johnf3f
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Nov 04, 2016 14:24 as a reply to  @ runninmann's post |  #13

Thanks, I thought it might be something like that but wanted to make certain.


Life is for living, cameras are to capture it (one day I will learn how!).

  
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ebiggs
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Nov 05, 2016 17:01 |  #14

johnf3f wrote in post #18175157 (external link)
I have often heard erasers recommended to clean contacts - but have never used one!

Is the problem that they may be too abrasive? Generate debris?

I haven't needed to clean contacts yet (thankfully) just interested in case I do in the future.

It isn't the "debris" that causes the harm but I suppose they could. The gold plating on the contacts is micron thin. It is extremely easy to rub it off. It can not be replated once that is done. It is a replacement thing.

It is so rare that even cleaning the contacts correctly ever fixes the problem. I can't remember when it ever did and I have been doing photography for 50+ years.


G1x, EOS 1Dx, EOS 1D Mk IV, ef 8-15mm f4L,
ef 16-35mm f2.8L II, ef 24-70mm f2.8L II, ef 70-200mm f/2.8L IS II,
Sigma 150-600mm f5-6.3 DG OS HSM Sport
*** PS 6, ACR 9.3, Lightroom 6.5 ***

  
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johnf3f
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Nov 05, 2016 17:25 as a reply to  @ ebiggs's post |  #15

Thanks, I was wondering if some of the more abrasive erasers may do this sort of thing of the debris might be a problem.

I often get asked questions about gear but this is a particular point that I have no experience of so I wanted to get others experiences/knowledge.

Thanks again.


Life is for living, cameras are to capture it (one day I will learn how!).

  
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HELP! Canon EF 28-135mm Problems
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