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Thread: Black spot in pictures

  1. #1

    Default Black spot in pictures

    Hi

    I notice that when I take picture with small aperture, there is some black spots in the picture. I am able to duplicate it.

    However, it will not be there with big aperture.

    So can I conclude that it is actually the lense that is dirty and not the CCD sensor? Cos the CCD is behind the aperture which means that the aperture size should not affect it. Is this correct?

    But what bothers me is that even when I change lense, it is still there.
    i have cleaned my lense and do not see any dirt on it. Please advise if it is the lense or the CCD the is dirty.

  2. #2
    Senior Member Kit's Avatar
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    Default Re: Black spot in pictures

    Dust on sensor.

    Very seldom your sensor can register dust on lenses.

  3. #3

    Default Re: Black spot in pictures

    So dust on sensor is also affected by aperture size?

  4. #4
    Senior Member Kit's Avatar
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    Default Re: Black spot in pictures

    Quote Originally Posted by Richter View Post
    So dust on sensor is also affected by aperture size?
    They are not affected by aperture size. Dust is always there no matter what aperture you use. They are just more visible when you shoot with a smaller aperture.

  5. #5

    Default Re: Black spot in pictures

    okok
    thanx

    i think it's the sensor then. sigh.
    guess i need to spend some money to clean the sensor le.

    dun wish to do it myself as i scratched my sensor the other time i try it.

    hahhaa

  6. #6
    Senior Member Kit's Avatar
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    Default Re: Black spot in pictures

    If its not too much, you can always clone them off.

  7. #7

    Default Re: Black spot in pictures

    mmm just a couple ot spots
    not too severe.. In fact at f27, it is already blurred. have not try at f16 yet

    thanx for the advise. U sure gave me alternative solutions.
    hehehe I have never thought of using cloning.
    :-)

  8. #8
    Senior Member darrrrrrrrrr's Avatar
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    Default Re: Black spot in pictures

    Why don't you avoid small apertures, especially f22 and beyond? I believe the blurring you are experiencing at f27 is due to diffraction and not the sensor dust.

    At larger apertures, sensor dust will be less visible and you will avoid the ill-effects of diffraction at such small apertures.

    http://www.bobatkins.com/photography...ffraction.html

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