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Thread: Dirty bokeh?

  1. #1
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    Default Dirty bokeh?

    So I was playing around with my 50mm and I took some random bokeh photos and I got these:





    What could cause those specks? Could it be dust on my lens or sensor? I checked my lens and I'm sure the elements are pretty dust free but I know my sensor is getting dusty already.

  2. #2
    Senior Member Numnumball's Avatar
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    Default Re: Dirty bokeh?

    U answered ur own qs.. Get ur sensor cleaned
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  3. #3
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    Default Re: Dirty bokeh?

    Get your sensor cleaned to comfirm your answer.haha

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    Senior Member sinned79's Avatar
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    Default Re: Dirty bokeh?

    hmm i always thought if you shoot small aperture, you will see those dust spots...

    these bokehs shot with wide apertures?

    then your sensor must be so dirty!

  5. #5
    Senior Member ZerocoolAstra's Avatar
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    Default Re: Dirty bokeh?

    don't think it's dirt leh...
    But no harm getting sensor cleaned just to be sure.
    To me looks like imperfection in the lens coating.

    I dunno for sure... hehehe am not an optics engineer...
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    Member enzeru21's Avatar
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    Default Re: Dirty bokeh?

    i think its the lens... maybe as what they pointed out..

    quite serious like that leh.. my 50mm doesnt give anything like that.. also my 50 give pentagon shaped bokeh.. haha..
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  7. #7

    Default Re: Dirty bokeh?

    Check your lens and filter, if nothing wrong, clean your sensor

  8. #8

    Default Re: Dirty bokeh?

    Could it be due to lots of lightings from different sources?

  9. #9
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    Default Re: Dirty bokeh?

    Quote Originally Posted by enzeru21 View Post
    i think its the lens... maybe as what they pointed out..

    quite serious like that leh.. my 50mm doesnt give anything like that.. also my 50 give pentagon shaped bokeh.. haha..
    Mine too but it only gives nice round bokeh at f/1.8

    Guess it's time to head down to Canon CSC to clean my sensor since my lens have no problems and I'm not using any filter.

  10. #10
    Senior Member sinned79's Avatar
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    Default Re: Dirty bokeh?

    Quote Originally Posted by Scandiacus View Post
    Mine too but it only gives nice round bokeh at f/1.8

    Guess it's time to head down to Canon CSC to clean my sensor since my lens have no problems and I'm not using any filter.
    u got other lens to test?

  11. #11

    Default Re: Dirty bokeh?

    Your dust specks do not seem to be on the same location..As ZerocoolAstra said, it looks like some coating imperfections which appear at specific light conditions..I might be wrong, but check whether your sensor's free of dust as well..

  12. #12

    Default Re: Dirty bokeh?

    It's not your camera's sensor. There are tiny specks of dust in your lens that are virtually invisible under room light. Use a torch light to verify. This tiny specks of dust does affect "bokeh" quality. No matter how hard or how clean your sensor is, the answer lies on your lenses.

  13. #13
    Senior Member ovaltinemilo's Avatar
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    Default Re: Dirty bokeh?

    if it's not lens, not sensor dirt.....then my guess: ISO noise. you are shooting at iso1600. can try again at iso 100?
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  14. #14
    Member Sispecho's Avatar
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    Default Re: Dirty bokeh?

    Quote Originally Posted by ovaltinemilo View Post
    if it's not lens, not sensor dirt.....then my guess: ISO noise. you are shooting at iso1600. can try again at iso 100?
    Wah ISO noise that Jia LAt arh?

    It looks like sthg you would see under the microscope man...

  15. #15
    Moderator daredevil123's Avatar
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    Default Re: Dirty bokeh?

    Hmmm, I've never seen anything quite like this.

  16. #16

    Default Re: Dirty bokeh?

    It is definitely not ISO noise. I think it is some very small dust on the elements, probably the near the outermost element, since the effect is somewhat like those "bokeh modifiers".

    I personally dont think its imperfect coating.. I have a zeiss lens that had on a few occasions, captured something like this before.. and zeiss is well known to have good coatings (mine wasnt some 20yr old zeiss lens btw, pretty new)
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  17. #17
    Member enzeru21's Avatar
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    Default Re: Dirty bokeh?

    Maybe should see what the CSC guys say... we are all just trying to guess...
    enzeru21 Canon 500D |Tamron17-50mm f/2.8| Sigma30mm f/1.4 | 580EX II
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  18. #18

    Default Re: Dirty bokeh?

    the most likely cause could be a dirty rear lens element.... dirt on rear lens element will manifest in bokeh one...

    use a blower/lens pen on it + blow blow the sensor abit... and see how it goes.... however, if it happens to be a big piece of dust on the rear element INSIDE the lens... then u ned to seek CSC help...

    pardon me if my noob diagnosis is wrong...
    Last edited by Akatsuki; 22nd August 2010 at 08:00 AM.
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  19. #19

    Default Re: Dirty bokeh?

    i have the same problem as well
    just that the dots seems to be on the same area of the bokeh circle
    http://www.clubsnap.com/forums/showthread.php?t=751565

    did a test with my 18~55 as well
    it's there also
    i suspect a dirty sensor
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