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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 27 Jul 2018 (Friday) 11:55
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Canon 10-18mm Back element removal

 
clementfaria
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Jul 27, 2018 11:55 |  #1

Hi there everyone.

I have been using a Canon 10-18mm lens for a while now and it's great. Some time ago It got wet and a drop of water somehow settled on the inside of the rear element. Now all of the photos have a small blur on them due to this. I have been searching the internet but found nothing to help me. (other than a EF-s - EF conversion)

I tried taking apart the back of the lens and got to the rear element, but I am unsure how to remove it. A few lenses that I took apart, there were a cap that you unscrew and the rear element just pops out. Have anyone tried taking apart a 10-18mm or tried removing the rear element glass.


Any help or advice would be appreciated.




  
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mcoren
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Jul 27, 2018 14:05 |  #2

Have you tried sealing the lens in an airtight container (e.g. gladware) with some dessicant like silica gel or DampRid? Maybe it will evaporate out in a couple of days.

Mike


Canon EOS 7D Mark II, EOS M5, and EOS 100 (film SLR)
A bunch of Canon lenses and a couple of Sigmas
A backpack, a bicycle, and a pair of hiking boots

  
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clementfaria
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Post edited 8 months ago by clementfaria.
     
Jul 27, 2018 15:13 as a reply to  @ mcoren's post |  #3

Hey Mike....the moisture already evaporated and left a little residue on the back element...it was salt water :/

Very annoying but other than that the lens works well.

I'll try your advice still.....I have nothing to lose :D




  
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John ­ from ­ PA
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Aug 06, 2018 09:33 |  #4

As you've already stated, evaporation has already occurred, so the desiccant idea is an exercise in futility.

The disassembly of many lenses within the same manufacturer tends to be similar. Lens Rentals has some disassembly instructions for several Canon lenses so look them over and see if you get anything worthwhile from the content. As a suggestion check these links:

https://www.lensrental​s.com …course-we-took-one-apart/ (external link)

https://www.lensrental​s.com …35mm-f1-4-mk-ii-teardown/ (external link)

https://www.lensrental​s.com …own-best-built-lens-ever/ (external link)




  
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clementfaria
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Aug 11, 2018 10:06 as a reply to  @ John from PA's post |  #5

Many thanks. I will check it out and let you know the outcome




  
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clementfaria
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Aug 12, 2018 11:59 |  #6

UPDATE: I managed to get the lens taken apart following one of the guides that was posted.

I also found a disassembly video on youtube from a guy who took his apart here https://www.youtube.co​m/watch?v=e-L5pJ-SovY (external link)
That also helped alot.

The water had solidified and stuck to on of the inside elements.

I took some photos of the process in case anyone has/had the same problem.
See it here on my Website http://www.clementfari​a.com/blog/p2_articlei​d/19 (external link)

Again Thanks for the help John


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mcoren
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Aug 12, 2018 13:21 |  #7

clementfaria wrote in post #18682769 (external link)
UPDATE: I managed to get the lens taken apart following one of the guides that was posted.

I also found a disassembly video on youtube from a guy who took his apart here https://www.youtube.co​m/watch?v=e-L5pJ-SovY (external link)
That also helped alot.

The water had solidified and stuck to on of the inside elements.

I took some photos of the process in case anyone has/had the same problem.
See it here on my Website http://www.clementfari​a.com/blog/p2_articlei​d/19 (external link)

Again Thanks for the help John


thumbnail
Hosted photo: posted by clementfaria in
./showthread.php?p=186​82769&i=i200862892
forum: Canon EF and EF-S Lenses

Great job, and thanks for photographing the steps you took. Glad to read that the reassembled lens is performing well!

Just one minor nitpick: what you saw on the lens element was probably residue left behind when the water evaporated. Water doesn't normally solidify above 32 deg F/0 deg C. :)

Mike


Canon EOS 7D Mark II, EOS M5, and EOS 100 (film SLR)
A bunch of Canon lenses and a couple of Sigmas
A backpack, a bicycle, and a pair of hiking boots

  
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clementfaria
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Aug 12, 2018 14:09 as a reply to  @ mcoren's post |  #8

you are correct, probably salt residue. I'm going to give it a field test and see the results.




  
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Left ­ Handed ­ Brisket
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Aug 12, 2018 14:13 |  #9

Very cool that you followed up with your results.

Hope everything is in working order.


PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20

  
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Canon 10-18mm Back element removal
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