How did dust get inside my lens?

Discussion in 'Digital Photography' started by gammamonk, Mar 6, 2007.

  1. gammamonk macrumors 6502a

    gammamonk

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    #1
    I was using my Canon 30D for the first time in a while, and I noticed a fairly large fiber sitting smack dab in the middle of the inner lens of my 28-135mm lens.

    Does anyone know how this could have happened, or what I can do about it? I tried tapping the lens gently, but it didn't have any effect.
     

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  2. wmmk macrumors 68020

    wmmk

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    #2
    hard to see from the picture, but it may actually be at the back of your lens. I got dust there on my tamron once, but it was easy to clean off.
     
  3. seniorstinky macrumors regular

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  4. pdpfilms macrumors 68020

    pdpfilms

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    #4
    As the elements expand and contract with zooming and/or focusing, air moves in and out of the lens. Musta sucked that bugger up.
     
  5. G5Unit macrumors 68020

    G5Unit

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    #5
    So casual, so great.
     
  6. gammamonk thread starter macrumors 6502a

    gammamonk

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    #6
    Oh man, that sucks. Is there anything I can do about it?
     
  7. pdpfilms macrumors 68020

    pdpfilms

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    #7
    Not that I'm aware of, other than bring it to a Canon repair place and have them take it apart. I've got a few dust bunnies on the inside of my lens, but none of them are that big or smack dab in the center. You just got unlucky.
     
  8. ChrisA macrumors G4

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    #8
    Many lenses change their length when you focus or sometime when you zoom. When they change length air is forced in or out of the lens. Some of the better lenses have seals to prevent dust and water from getting in but most don't

    Don't worry about it. A small spec of dust does not block much light. Think of the square area of the speck compared to the square area of the glass. No noticeable effect.
     
  9. Father Jack macrumors 68020

    Father Jack

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  10. G4scott macrumors 68020

    G4scott

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    #10
    On a somewhat related note... My Canon G7 has dust inside of the outermost lens element... Unfortunately, I'll have to send it in to have them clean it out, but I don't think it's good at all that dust should so easily be able to get into a built in lens. One or two specks may not be noticeable, but if it keeps building up...

    Grr...
     
  11. failsafe1 macrumors 6502a

    failsafe1

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    #11
    If the dust is near the front elements of the lens it is actually out of focus and will not be seen in the photo. As it gets nearer the rear of the lens it gets sharper and could cause trouble but very doubtful. Dust on sensors for digital are the real culprit not on the lens.
     
  12. bluewire macrumors member

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    #12
    God that sucks. My buddy had a huge piece of dust on his viewfinder mirror, how it got there I have no idea but it was very irritating to see this huge dust particle...I felt sorry for him he tried everything to get that thing off but to no avail...
     
  13. job macrumors 68040

    job

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    #13
    Do Canon's L Series lenses have this problem?
     
  14. pdpfilms macrumors 68020

    pdpfilms

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    #14
    Well the thing is, for any lens, no matter how expensive- if there are elements moving around inside, air has to be exchanged. An air-tight seal would create a vacuum and would not allow for movement. Higher-end lenses have moisture-resistant seals, but none are air-tight.

    Dust inside the lens is an issue with every lens I've ever used. I don't think there's any way around it.
     
  15. nickster9224 macrumors 6502a

    nickster9224

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  16. job macrumors 68040

    job

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    #16
    Gotcha. Thanks for the answer.

    I figured since the front of the Canon L lenses don't actually travel, they would be less prone to be affected by dust problems.
     

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