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Thread: DUST Visible from F2.8 - F5.6 in picture

  1. #1

    Default DUST Visible from F2.8 - F5.6 in picture

    Hi guys, just want to ask if you encountered a dust problems in your pictures but only visible when using a big aperture like F2.8 - F5.6. By F6.3 and up until F18, the dust can no longer be seen. I just find it really strange as the dust is not with the lens since I tried using 2 of my other lenses. Looks like the dust is inside the camera..not sure if it's in the mirrors/sensor. Could anyone share similar experiences? Please click on the sample pics below. Thanks!

    Here are sample pics:
    F2.8


    F4.0


    F5.6


    F6.3


    F7.1
    Last edited by kodakero12; 21st June 2010 at 11:50 PM.

  2. #2

    Default DUST Visible from F2.8 - F5.6 in picture

    Hi guys, just want to ask if you encountered a dust problems in your pictures but only visible when using a big aperture like F2.8 - F5.6. By F6.3 and up until F18, the dust can no longer be seen. I just find it really strange as the dust is not with the lens since I tried using 2 of my other lenses. Looks like the dust is inside the camera..not sure if it's in the mirrors/sensor. Could anyone share similar experiences? Please click on the sample pics below. Thanks!

    Here are sample pics:
    F2.8


    F4.0


    F5.6


    F6.3


    F7.1

  3. #3

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    If it's the sensor, you can try using a blower and if that fails, take it to the service centre for cleaning.

  4. #4
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Got anything where you circled meh? Perhaps you should try to traditional way of checking for dust, which is to shoot at a blank area at small apertures... like the blue sky in the mornings... Can't really tell if your sample picture is of the same subject at the same position, coz it could very well be the subject itself, or lighting artifacts, or dead pixel, or whatever... If you see the same spot on different photos, then the possibility of it being dust is higher.
    incywincyspider climbup the waterspout...

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    Moderator daredevil123's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    I am sorry. The pics are too small. It would be nice if you can show 100% crops of the dust speck in question.

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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    the part where u circled in the picture does not look like dust to me.
    it looks more like "dead pixel" from what i see in ur small picture. i could be wrong, i am just guessing here. if it is dead pixel then when u shoot at such small apertures (F18) and bump up the ISO, u can't distinguish it from the noise.
    do u have other larger pictures which u can post here?
    cameras are not made of tofu

  7. #7

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Already tried the traditional way of shooting at small apertures and when I checked my pictures (even at 100%), there was no dust visible. Please click on the small image and it will take you to a site which you can view the image at 100% crop. In that way you can see the small speck inside the circle.

    I'll post again some pics later after work with a different subject and including smaller apertures

  8. #8

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    If I take a F2.8 exposure and check the lcd screen of my camera zoomed in at 40-100%, the dust is visible. I checked my raw files in lightroom using my laptop and the speck of dust (can only see 1) is still there. I did one final check and viewed the raw files in my 27inch imac and dust is there. I hope its just dead pixel but its not. I tried using my prime lens using F2.8 exposure and the dust is still there. Is this something common - dust appearing when a big aperture is used? I'm afraid if I take it to service centre, they will just add more dust to my sensor. Really need your advise :s

    PS- ill post more pics later, 2 different lens and also including small apertures. Thanks for reading!

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    Moderator daredevil123's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Quote Originally Posted by kodakero12 View Post
    If I take a F2.8 exposure and check the lcd screen of my camera zoomed in at 40-100%, the dust is visible. I checked my raw files in lightroom using my laptop and the speck of dust (can only see 1) is still there. I did one final check and viewed the raw files in my 27inch imac and dust is there. I hope its just dead pixel but its not. I tried using my prime lens using F2.8 exposure and the dust is still there. Is this something common - dust appearing when a big aperture is used? I'm afraid if I take it to service centre, they will just add more dust to my sensor. Really need your advise :s

    PS- ill post more pics later, 2 different lens and also including small apertures. Thanks for reading!
    Actually, you should be more worried that it might be dead pixel. Dead pixel cannot fix, can only remap the sensor. Dust can clean.

    And no, it is not common. Usually dust can only be seen at small apertures. And if dust is in the lens, it is usually invisible unless it is near the aperture blades, and the aperture is smaller.

    If it shows on 2 different lens, then it has to be either a dead pixel, or dust on sensor. Give your sensor a good blow and see if the problem persist.

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    Moderator Francis247's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Thread merged.
    No need to spam across 2 subforums.
    莫问前程有愧,只求今生无悔. Time pasts, Places changed, Beauty faded, what is left are Photos of Memories…

  11. #11

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Thanks Francis, won't happen again

    Is it possible that a pixel suddenly died? My camera is less than a year - only 8months with less than 5k shutter count.
    If I go for sensor cleaning, is there a way for them to check if i have dead pixels in my sensor too? If the 'dust' cant be
    removed after the sensor cleaning, is it safe to assume that it's a dead pixel and not a stubborn dust? Is dead pixel part of the warranty?

  12. #12

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Dead/hot pixels are show as dark/black spots. Mine looks like a golden cross when zoomed at 100%, hopefully it’s just stubborn dirt (hopefully )

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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    as far as i know of, the defective pixels can appear as bright spots as well.
    if it is still under warranty, maybe you can try paying a visit to the service center to see what they can do for you. most likely they will do some pixel mapping so that it does not show up again.
    it is common to get dead pixels on sensors (IIRC).

    yes i do agree that u should give ur sensor a good "blow" and test again. visually inspect the sensor for dirt first. if a young person's eyes can't see it, most likely it should not be a problem.

    just don't get too upset at this point of time. update us again.
    cameras are not made of tofu

  14. #14
    Senior Member ovaltinemilo's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    can try blow your sensor and post a bigger pic taken by it again?
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    For dead or hot pixels, it depends on the percentage. Greater than a certain percentage and it will be covered under warranty as it is considered manufacturing defect.

    For 1 or 2 pixels, maybe they'll just remap for you.

  16. #16

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    @fotophilic 0 - i've checked the mirrors (center and top) and it looked clean besides some small particles which I think
    may not cause the 'dust' in my pictures. i also checked the thing that covers the sensor and it looked clean too. So i guess,
    ill ask the service centre to check for dead pixels and have it remapped. By the way, is there a software that we can use
    to check for deadpixels? have any idea how much to do remapping for 1 or 2 pixels?

    @ovaltinemilo - will try to post bigger pictures tonight.

    @limsgp - didnt know theres a certain percentage to be covered under warranty. thanks for the info!

  17. #17

    Default Re: DUST Visible from F2.8 - F5.6 in picture

    hi guys, please check these 2 pics (those inside the circle). It looks like a golden + sign. So i'm guessing it's a dead pixel and not a stubborn dust. So camera will go to service center for remapping... any idea how long it takes for the remapping? Thanks for reading!


    http://i302.photobucket.com/albums/n...s3y/dead_1.jpg

    http://i302.photobucket.com/albums/n...s3y/dead_2.jpg

  18. #18
    Senior Member ovaltinemilo's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Quote Originally Posted by kodakero12 View Post
    hi guys, please check these 2 pics (those inside the circle). It looks like a golden + sign. So i'm guessing it's a dead pixel and not a stubborn dust. So camera will go to service center for remapping... any idea how long it takes for the remapping? Thanks for reading!


    http://i302.photobucket.com/albums/n...s3y/dead_1.jpg

    http://i302.photobucket.com/albums/n...s3y/dead_2.jpg
    The links are dead too....
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    Senior Member sinned79's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Quote Originally Posted by ovaltinemilo View Post
    The links are dead too....

  20. #20
    Senior Member ovaltinemilo's Avatar
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    Default Re: DUST Visible from F2.8 - F5.6 in picture

    Quote Originally Posted by sinned79 View Post
    Lucky, i thot I was the only one who finds it funny that it seems like TS has to deal with alot of dead stuffs..
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