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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 05 Apr 2009 (Sunday) 02:26
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Do lens coatings look 'powdery' or 'speckled'?

 
mrkgoo
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Apr 05, 2009 02:26 |  #1

I was just shining a flashlight at the undersurface of the front element of my 17-55 - if you look VERY carefully (or under bright sunlight), you can see a fine speckled appearance, or powdery appearance. Is this normal? Is this just the lens coating?

note that it's not on all lens surfaces. It appears most obviously only on the back surface of the front element of that lens. It's possible other lenses may or may not exhibit it.




  
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KarlosDaJackal
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Apr 05, 2009 09:50 |  #2

sounds like the 17-55's infamous dust in the front element coating.


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RDKirk
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Apr 05, 2009 13:21 as a reply to  @ KarlosDaJackal's post |  #3

Shining a flashlight into a lens is like peeking into the kitchen of your favorite restaurant. Both are things you should never do, if you intend to continue being satisfied with either.


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droopy1592
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Apr 05, 2009 16:05 |  #4

RDKirk wrote in post #7671854 (external link)
Shining a flashlight into a lens is like peeking into the kitchen of your favorite restaurant. Both are things you should never do, if you intend to continue being satisfied with either.

Why wouldn't you if the lens is not on the camera?


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mrkgoo
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Apr 06, 2009 00:49 |  #5

well, it's much too fine to be dust. It nearly looks like a matte coating. I've seen some other people ask similar questions, but it seems from the answers that the responders don't really know what the op is talking about. Try shining a flashlight at a very oblique angle and try to visualize the reflection off the back surface of the front element.

I guess it is a risky thing to do, but I don't really fear it. I know what crazy things go on in a restaurant kitchen. I've worked in a few. It's true you don't want to know.




  
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ed ­ rader
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Apr 06, 2009 01:13 |  #6

droopy1592 wrote in post #7672746 (external link)
Why wouldn't you if the lens is not on the camera?

cockroaches :D.

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Do lens coatings look 'powdery' or 'speckled'?
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