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Thread: red dots on picture

  1. #1
    Member dennysuh's Avatar
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    Default red dots on picture

    When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.

  2. #2

    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.
    Can't see the photo, guessing it might be hot pixels but need to see pic to be sure.

  3. #3

    Default Re: red dots on picture

    cant see the photo either but may be ghosting. i had the same problem with night photog. try taking off your UV filte and see if it helps?

  4. #4
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    When I took my picture @ marina bay last night, I saw the red dots on my picture. Btw I used the Hoya UV filter for my lens. I attached the photo for your easy checking. These red dots are only can see in the dark like night photography. May I know is this sensor or lens or filter problem? thanks.
    http://www.flickr.com/photos/54694723@N03/5064571607/

  5. #5

    Default Re: red dots on picture

    private page...

  6. #6

    Default Re: red dots on picture

    Its a private photo, still can't view it

  7. #7
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Quote Originally Posted by spree86 View Post
    Can't see the photo, guessing it might be hot pixels but need to see pic to be sure.
    Quote Originally Posted by stealthsilhouette View Post
    cant see the photo either but may be ghosting. i had the same problem with night photog. try taking off your UV filte and see if it helps?
    Quote Originally Posted by spree86 View Post
    Its a private photo, still can't view it
    Sorry Guys. I try to upload the picture but still can't. I'll try again later.

  8. #8
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    Sorry Guys. I try to upload the picture but still can't. I'll try again later.
    [IMG]DPP_1 by dennysuh, on Flickr[/IMG]

  9. #9

    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    [IMG]DPP_1 by dennysuh, on Flickr[/IMG]
    Can't really see that clearly but it looks like regular noise to me, what ISO setting did you use when u took this shot?

  10. #10
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Iso 200, f/22, shutter speed 30 and I used Hoya UV filter.

  11. #11

    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    Iso 200, f/22, shutter speed 30 and I used Hoya UV filter.
    Hmm noise shouldn't be an issue at ISO 200, might be caused by your filter, you should remove your UV filter for long exposures and night shots to prevent any flaring or ghosting.

  12. #12

    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    Iso 200, f/22, shutter speed 30 and I used Hoya UV filter.
    That's your issue right there. You're shooting at f/22, so your picture will be softer as it suffers from diffraction. The noise you're seeing is long-exposure ISO noise since you were at 30 seconds.

    Try opening up to f/16 or even f/11 and adjust shutter speed accordingly, then try again. It's not a filter issue.
    Alpha

  13. #13
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Quote Originally Posted by Rashkae View Post
    That's your issue right there. You're shooting at f/22, so your picture will be softer as it suffers from diffraction. The noise you're seeing is long-exposure ISO noise since you were at 30 seconds.

    Try opening up to f/16 or even f/11 and adjust shutter speed accordingly, then try again. It's not a filter issue.
    Quote Originally Posted by spree86 View Post
    Hmm noise shouldn't be an issue at ISO 200, might be caused by your filter, you should remove your UV filter for long exposures and night shots to prevent any flaring or ghosting.
    Rashkae & spree86 thanks for your advices. Noted with thanks.

  14. #14
    Moderator daredevil123's Avatar
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    Default Re: red dots on picture

    I am sorry. I did not see any dots on your pictures.

  15. #15

    Default Re: red dots on picture

    Quote Originally Posted by daredevil123 View Post
    I am sorry. I did not see any dots on your pictures.
    Must pixel-peep to 100% then you see a little of the normal noise. I think ts is expecting 100% clean images without realizing you'll never get that.
    Alpha

  16. #16

    Default Re: red dots on picture

    Some times if you see very pronounced red spots, they might be hot spots. I do get some after shooting long exposures and especially when using live view.

  17. #17
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    Default Re: red dots on picture

    They are called hot pixels.

  18. #18
    Member dennysuh's Avatar
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    Default Re: red dots on picture

    Quote Originally Posted by linse View Post
    They are called hot pixels.
    hot pixels?? Shall I send it to Cannon for checking? My camera is still under warranty. Thanks.

  19. #19

    Default Re: red dots on picture

    Quote Originally Posted by dennysuh View Post
    hot pixels?? Shall I send it to Cannon for checking? My camera is still under warranty. Thanks.
    It's normal with long exposures. It's generally not visible. Stop pixel peeping.
    Alpha

  20. #20

    Default Re: red dots on picture

    hot pixels can be cured..

    set to manual cleaning with the body cap on without any lens attached..

    let the mirror flip up and shutter opened for about 5-10mins... then turn the camera off..

    best to do it in a dark area so no stray light enter via viewfinder or any other crevices.

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