Dust in my lens....normal?....

Discussion in 'Digital Photography' started by slick316, Aug 23, 2008.

  1. slick316 macrumors 6502

    Joined:
    Sep 28, 2005
    #1
    I forgot to post this yesterday. I was cleaning some smudges on my 18-200mm VR (I have a tiffen filter on it). I noticed some dust on the filter that wasn't coming off, it was obviously on the other side. I unscrewed the filter, and found that it was actually behind the glass of the lens. About 4-5 white specks, right in the middle of the lens.
    Sorry for the lack of pictures, I didn't take any and I'm not at home right now. But is this normal? I looked back at pictures I have taken recently and I don't see any issues with them, so I am thinking its not a big deal, but I know that they weren't there when I bought the lens.
    Just wondering if I am over reacting or if I should have it taken care of.
     
  2. Westside guy macrumors 601

    Westside guy

    Joined:
    Oct 15, 2003
    Location:
    The soggy side of the Pacific NW
    #2
    Any lens that's seen a moderate amount of use will have some dust inside - it's just the result of normal wear and tear. Unless you've got clouds of it, the dust won't affect the optics (neither will small scatches on the lens btw).
     
  3. epicwelshman macrumors 6502a

    epicwelshman

    Joined:
    Apr 6, 2006
    Location:
    Nassau, Bahamas
    #3
    And even if you do see some in your images (like dust on the sensor) then it's easy to remove them in photoshop, or I imagine any image editing program.
     
  4. slick316 thread starter macrumors 6502

    Joined:
    Sep 28, 2005
    #4
    Its good to know. I wasn't panicking or anything, I was just wondering since my other lenses don't have dust in them (yet).

    Thanks for the help guys.
     
  5. digitalfrog macrumors regular

    digitalfrog

    Joined:
    Nov 26, 2007
  6. rogersmj macrumors 68020

    rogersmj

    Joined:
    Sep 10, 2006
    Location:
    Indianapolis, IN
    #6
    Words to live by :p
     
  7. ChrisA macrumors G4

    Joined:
    Jan 5, 2006
    Location:
    Redondo Beach, California
    #7
    Dust on a lens element is not like dust on the sensor. Dust on the lens has not effect on the final image. Even scratches on the lens have no effect. What you have to look at is the total square area blocked by the dust/scratch compared to the total square area of the lens' front element. The dust is very, very small compared to the size of the lens.

    Remember that every part of the lens contributes to each pixel, so dust does not make a shadow like it could if it were on the sensor

    It gets inside because when to focus or zoom a lens, parts inside move and act like a piston inside an air pump, dust gets sucked inside and blown around.

    If the area becomes larger then it will have some effect. Photographers have taken advantage of this by making filters with things like black or white dots painted on them. It's a way to soften the contract an image without introducing blur. Tricks like this were common with Hollywood film makers 60 years ago.
     

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