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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Aug 2012 (Thursday) 18:50
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Dust under my lens!

 
Mornnb
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Aug 30, 2012 18:50 |  #1

IMAGE: https://img.skitch.com/20120831-cdcbp9wu6wg9h77f94hruq5kni.jpg

My 15-85mm taken with the 50mm.
I'm probably OCD and crazy because I know it probably doesn't affect image quality much, but it still bothers me! The 15-85mm seems to readily suck up dust. Is there any way to remove it?

Canon 5D Mark III - Leica M240
EF 16-35mm F/4 IS L - EF 14mm f/2.8 L II - - EF 17mm TS-E L - EF 24-70mm f/2.8 L II - EF 70-200mm IS II f/2.8 L - Sigma 35mm f/1.4 Art - Sigma 85mm f/1.4 EX
Voigtlander 15mm III - 28mm Elmarit-M ASPH - 35mm f/1.4 Summilux-M FLE - 50mm f/1.4 Summilux-M ASPH
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BryantFC
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Aug 30, 2012 18:52 |  #2

Other than sending it into Canon, no. Live with it. We all do ;).


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Invertalon
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Aug 30, 2012 19:00 |  #3

Don't worry about dust unless its loaded up. It will do nothing to the IQ of the lens and even the $2500+ lenses get dust in them even though they are dust sealed and all that.


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DreDaze
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Aug 30, 2012 19:05 |  #4

stopping looking into your lens...and you won't see the dust...


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Nature ­ Nut
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Aug 30, 2012 19:09 |  #5

Just remember your camera captures light, not an image, so you will never see those spots. Its equivalent to putting your hand in the air to reflect the sun to stop global warming. Now dust on the rear element or your sensor have a better chance of showing up. When I first got into DSLR's I was OCD too about every spec of dust. One new focus screen and a smudge on my sensor later, I learned that as long as my images came out spotless, the dust isn't hurting anyone. just dont crank your f/stop to the max and shoot a white wall, then your OCD will really kick in.


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s2kennyc
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Aug 30, 2012 19:32 |  #6

Don't worry about it. My $2300 70-200 II has a couple of specs of dust in it. It happens with use. You'll learn to get used to it because it has absolutely no effect in the final image.


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crn3371
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Aug 30, 2012 19:36 |  #7

Don't worry about it as it doesn't show in pics. Even if you sent it to Canon for cleaning you'd start seeing dust again after a few months. Live with it.




  
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msowsun
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Aug 30, 2012 20:40 |  #8

Mornnb wrote in post #14928296 (external link)
The 15-85mm seems to readily suck up dust. Is there any way to remove it?

Yes, the 15-85 is constructed just like the 17-55 and you can easily remove the front element, blow out the dust, and then replace the front element.

It is really quite easy to do with very little chance of messing anything up. You just remove the press on sticker, then remove 3 screws and the big one-piece front element drops out into your hand. Blow out the dust and put it back together.

POTN threads...

https://photography-on-the.net/forum/showthre​ad.php?t=734990

https://photography-on-the.net/forum/showthre​ad.php?t=602724

https://photography-on-the.net …/showthread.php​?t=1008073

Here are some how to Videos....
(watch all of them)

http://youtu.be/SZxN4v​4m6Ts?t=1m26s (external link)

http://youtu.be/PCNNty​EO9vY?t=40s (external link)

http://youtu.be/ehZeI5​ia6xw?t=1m44s (external link)

http://www.youtube.com​/watch?v=uXEAVv4G5cY (external link)..... Foreign language

http://youtu.be/tOZRN2​mxajk?t=2m35s (external link) .....English....but disregard the parts about checking focus, using loktite, and adding silicone sealer at the end.

Still photos with captions....

http://www.pbase.com/l​ightrules/drp (external link)

http://www.pbase.com/r​cicala/1755_is_surgery (external link)


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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mannetti21
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Aug 30, 2012 21:17 |  #9

I've cleaned my 17-55 (which is essentially the exact same process for cleaning the 15-85) in less than 5 minutes. If you know how t use a screwdriver, you can get rid of that dust easily.



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Mornnb
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Aug 31, 2012 10:50 |  #10

msowsun wrote in post #14928740 (external link)
Yes, the 15-85 is constructed just like the 17-55 and you can easily remove the front element, blow out the dust, and then replace the front element.

It is really quite easy to do with very little chance of messing anything up. You just remove the press on sticker, then remove 3 screws and the big one-piece front element drops out into your hand. Blow out the dust and put it back together.

http://youtu.be/tOZRN2​mxajk?t=2m35s (external link) .....English....but disregard the parts about checking focus, using loktite, and adding silicone sealer at the end.

Okay thanks. Done. Once you get the plastic label ring off, it's easy!
I noted this video was interesting though, it suggested the location of the screws might matter in terms of lens calibration, so I made careful note of the screw locations to put the lens back together exactly as it was! Silicone sealer is a crazy idea though, wouldn't using a UV filter be just as effective?

Anyway here after I popped the lens ring, took a photo so I could keep track of exactly where the screws should be.

IMAGE: http://img.skitch.com/20120831-e877h8xkj1d7u8xx5k3dbgytak.jpg

And after:

IMAGE: http://img.skitch.com/20120831-j8dabw5j6aipc4j845qces1euc.jpg

Canon 5D Mark III - Leica M240
EF 16-35mm F/4 IS L - EF 14mm f/2.8 L II - - EF 17mm TS-E L - EF 24-70mm f/2.8 L II - EF 70-200mm IS II f/2.8 L - Sigma 35mm f/1.4 Art - Sigma 85mm f/1.4 EX
Voigtlander 15mm III - 28mm Elmarit-M ASPH - 35mm f/1.4 Summilux-M FLE - 50mm f/1.4 Summilux-M ASPH
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DreDaze
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Aug 31, 2012 11:30 |  #11

great...now look at it again in 2 months, and you'll see dust :)


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crn3371
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Aug 31, 2012 14:59 |  #12

DreDaze wrote in post #14931100 (external link)
great...now look at it again in 2 months, and you'll see dust :)

It doesn't seem to me that the potential for damaging your lens is worth it. It's just going to come back.




  
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msowsun
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Aug 31, 2012 16:11 |  #13

crn3371 wrote in post #14931918 (external link)
It doesn't seem to me that the potential for damaging your lens is worth it. It's just going to come back.

That's what I used to think until I had dust spots showing up in my photos.... https://photography-on-the.net …p?p=11719838#po​st11719838

If you are shooting small objects at close distances, and small apertures(for more depth of field), dust under the front lens element can show up in the photos.


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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kay188
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Aug 31, 2012 16:16 |  #14

msowsun wrote in post #14932210 (external link)
That's what I used to think until I had dust spots showing up in my photos.... https://photography-on-the.net …p?p=11719838#po​st11719838

If you are shooting small objects at close distances, and small apertures (for more depth of field) dust under the front lens element can show up in the photos.

Time to bring my 16-35L back for a cleaning.

They said they cleaned it, but when I picked it up the exact same dust specs were still there...


Ricoh GRD4 | Canon 1Ds, 1D, 1D2, 1D2n| Canon XTi | Tokina 11-16 F/2.8 | Canon 16-35L I | Canon 24 F/2.8 | Canon 35 F/2 | Canon 50 F/1.8 I | Canon 135L | Sigma 24-70 EX DG Macro | Sigma 70-200 F/2.8 APO EX DG | Sigma 30 F/1.4 |Sigma 50 F/1.4 |Sigma & Kenko 1.4x TC| Canon 580EX II | Sigma EF-500 Super | 2x Vivitar 285HV | RF-602 Triggers |

  
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bps
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Aug 31, 2012 23:31 |  #15

Nothing to worry about here. No big deal, especially on an 18-55.

Bryan


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Dust under my lens!
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