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Thread: Dirts or fungus?

  1. #1
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    Default Dirts or fungus?

    I took a few shots of the clear blue sky and filled up the frame with the light blue. To my surprise, I saw some round dots appearing at the same positions in all the four pictures I took.

    They are round and the size is about 1.5mm on a picture size of 20x13cm.

    I increased the contrast of the pictures and enlarged the picture size to 200% and found many more dots.

    This is how they look



    Are they dirts or fungus and where are they, on the lens, the mirror or the sensor?

    How to get rids of them?
    Last edited by LBL2009; 3rd November 2009 at 07:08 PM.

  2. #2
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    Default Re: Dirts or fungus?

    high chance on the mirror, and sensor
    Which model u using? Lift up the mirror, look at your sensor, if dust is there try use blower to see can clear^^
    Last edited by catola1010; 3rd November 2009 at 02:52 PM.
    Fujifilm Finepix X100

  3. #3

    Default Re: Dirts or fungus?

    Quote Originally Posted by catola1010 View Post
    high chance on the mirror, and sensor
    Which model u using? Lift up the mirror, look at your sensor, if dust is there try use blower to see can clear^^
    If it's on the mirror, it would not show up in the pictures.

    This is sensor dust. Get a blower and learn how to clean your sensor.
    Alpha

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    Default Re: Dirts or fungus?

    Thanks for the fast responses. Really appreciate it.

    I am using a D40.

    Blow the sensor? I suppose this is not an easy task. Have to find out how to do it.

  5. #5

    Default Re: Dirts or fungus?

    Quote Originally Posted by LBL2009 View Post
    Blow the sensor? I suppose this is not an easy task. Have to find out how to do it.
    It's very easy, and is also explained in your manual.

    http://www.lmgtfy.com/?q=how+to+clean+dslr+sensor
    Alpha

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    Moderator daredevil123's Avatar
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    Default Re: Dirts or fungus?

    To see the sensor dust more clearly, set smallest aperture possible, switch to MF, point to a white wall or something, and shoot. Easier to see the dust when shooting a white background.

    I blow my sensor every once in a while. I do it more on my old D40x before I sold it as it did not have anti dust system. Blower usually took care of the dust. Did not have to ever use any cleaning liquid, brush or pads.
    Last edited by daredevil123; 3rd November 2009 at 03:19 PM.

  7. #7

    Default Re: Dirts or fungus?

    Quote Originally Posted by daredevil123 View Post
    To see the sensor dust more clearly, set smallest aperture possible, switch to MF, point to a white wall or something, and shoot. Easier to see the dust when shooting a white background.

    I blow my sensor every once in a while. I do it more on my old D40x before I sold it as it did not have anti dust system. Blower usually took care of the dust. Did not have to ever use any cleaning liquid, brush or pads.
    As he said... white background will show dust more clearly, and you shouldn't ever ever use solvents or fluid on the sensor or hell stick stuff in your camera unless you know what you're doing. The most I'd recommend is a blower, and use it gently... otherwise it's time to send it to a shop.
    Last edited by Keenblade; 3rd November 2009 at 03:49 PM. Reason: typos
    better to be Socrates dissatisfied than a fool satisfied -J.S. Mill
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  8. #8

    Default Re: Dirts or fungus?

    Yup! thoses are dust speck on your sensors. just set your aperture to highest f number e.g 22 and snap at the sky or plain wall. (may want to manual focus) . Try not to blow at the sensor too often as there are chances of damage the sensor by accident. just go to the menu and select the Mirror up function. Face the camera down, remove lens, use a blower...never never touch the tip on sensor! unless you have sensor cleaning kit and know how to use it. If in doubt, please sent the D40 to nikon services to clean it. D40/x is a good camera.

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    Default Re: Dirts or fungus?

    Thanks all for the good advice.

    Looks like this is a routine maintenance if I change lenses often. Better learn to do it.

  10. #10

    Default Re: Dirts or fungus?

    If there are spots in photos, how to determind whether its sensor or lens dust that are causing it?

  11. #11

    Default Re: Dirts or fungus?

    Sensor dust: http://images.google.com.sg/images?h...gbv=2&aq=f&oq=

    Fungus results won;t show up in photos until it's too late - you'll see a general lowering of contrast as well as increased prone to flaring, and an overall 'soft-focus' effect. However, fungus on lenses look like this: http://images.google.com.sg/images?g...=f&oq=&start=0

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    Moderator daredevil123's Avatar
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    Default Re: Dirts or fungus?

    Quote Originally Posted by torak View Post
    If there are spots in photos, how to determind whether its sensor or lens dust that are causing it?
    When doing small-aperture-photo-at-the-wall test, if the dust looks very well defined, it is on the sensor. dust in the lens do not show up that clearly.

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    Default Re: Dirts or fungus?

    It may be on the mirror.
    I've encountered such problem before too. Just clean the mirror and see whether it has cleared..

  14. #14

    Default Re: Dirts or fungus?

    Quote Originally Posted by shaoken View Post
    It may be on the mirror.
    Dust on the mirror will not appear in the pics as what Rashkae wrote earlier

    Google and read up how a DSLR works

    If the dust on the mirror, usually you will see it through VF

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    Default Re: Dirts or fungus?

    Quote Originally Posted by shaoken View Post
    It may be on the mirror.
    I've encountered such problem before too. Just clean the mirror and see whether it has cleared..
    Huh? waaa, transparent mirror ar? Must be some new technology we all don't know about. Good. No more mirror flap to worry about in the future when taking long exposures.

  16. #16

    Default Re: Dirts or fungus?

    bring it to Nikon service center, if you are unsure... sensor cleaning about $20 odd...
    May good light follow wherever you go

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    Default Re: Dirts or fungus?

    Quote Originally Posted by daredevil123 View Post
    Huh? waaa, transparent mirror ar? Must be some new technology we all don't know about. Good. No more mirror flap to worry about in the future when taking long exposures.
    Sorry but it happened to me before.
    There are some dust on my sensor (my mistake to say it's mirror) and when I snap pics, I zoom in and saw spots like this too.

    After cleaning it, it's alright.
    Last edited by shaoken; 4th November 2009 at 08:13 PM.

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    Default Re: Dirts or fungus?

    Quote Originally Posted by shaoken View Post
    Sorry but it happened to me before.
    There are some dust on my sensor (my mistake to say it's mirror) and when I snap pics, I zoom in and saw spots like this too.

    After cleaning it, it's alright.
    Oh ok.. that clears it up.

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