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Thread: Small lines and bubbles in Photo, whats wrong?

  1. #1

    Default Small lines and bubbles in Photo, whats wrong?

    As below in the pic. Anyone has any idea?


    Settings was 85s, f13. There are 2 fine white lines, and bubbles. I'm sure there were no stars when i took the shot, so the 2 lines couldn't be stars.



    This was taken about 5mins earlier:
    Settings were 70s, f13



    Please enlighten me
    Last edited by takafan; 26th June 2010 at 10:06 PM.

  2. #2
    Member voxies09's Avatar
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    Default Re: Small lines and bubbles in Photo, whats wrong?

    i guess, your lens' dust?
    Canon Kiss X4 | 18-55mm f3.5-5.6 IS II Kit lens | 50mm f1.8

  3. #3

    Default Re: Small lines and bubbles in Photo, whats wrong?

    The lines are likely to be hot pixels. This happens when the sensor heats up due to long exposure.

    Do you have the same problem when taking shots as normal shutter speeds?
    hasta la justicia siempre

  4. #4

    Default Re: Small lines and bubbles in Photo, whats wrong?

    Nope, normal shorts no bubbles or the small white lines..

    Just that i was trying long exposure, then it happened.

  5. #5

    Default Re: Small lines and bubbles in Photo, whats wrong?

    Hmm. It's hot pixels then - I've got the same problem with my 40D when taking long exposures too.

    Guess the alternative solution is to clone out the affected area.
    hasta la justicia siempre

  6. #6

    Default Re: Small lines and bubbles in Photo, whats wrong?

    Quote Originally Posted by cmeptb72 View Post
    Hmm. It's hot pixels then - I've got the same problem with my 40D when taking long exposures too.

    Guess the alternative solution is to clone out the affected area.
    Even those big big bubbles are hot pixels ????

  7. #7

    Default Re: Small lines and bubbles in Photo, whats wrong?

    The bubbles are definitely not hot pixels. I'm not sure what they are
    hasta la justicia siempre

  8. #8

    Default Re: Small lines and bubbles in Photo, whats wrong?

    The big bubbles could be dust on the sensor and they show up since u are shooting at f13. Try shooting against a white background using f13 or f16 and see if the same spots appear
    Jerfotography Nikon D300
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  9. #9
    Member driveanegg's Avatar
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    Default Re: Small lines and bubbles in Photo, whats wrong?

    Big bubbles are dust, most prob on sensor
    The dust are in the same spot on both pictures ...

    Small white lines are light trails from stars - though they may not be obvious on taking the picture, long exposure will pick out tiny bits of light ....

    Hope that helps !!!
    Keep shooting !!!
    I probably collect lenses more than I take pictures
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  10. #10

    Default Re: Small lines and bubbles in Photo, whats wrong?

    Thanks for the replies. I have tried the methods and it's starting to improve a little ~

  11. #11
    Moderator daredevil123's Avatar
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    Default Re: Small lines and bubbles in Photo, whats wrong?

    The white bright lines are stars la. and they move in the sky slowly because the earth is turning. So when taking long exposure, they look like lines.

    The "bubbles" can be many things. Dust on lens or sensor or filter, stains on the lens/filter. It could also be condensation, or water drops. Clean your lens, filters and blow your sensor. Check again at small aperture F29 or something shooting a whilte wall.

  12. #12

    Default Re: Small lines and bubbles in Photo, whats wrong?

    Quote Originally Posted by daredevil123 View Post
    The white bright lines are stars la. and they move in the sky slowly because the earth is turning. So when taking long exposure, they look like lines.

    The "bubbles" can be many things. Dust on lens or sensor or filter, stains on the lens/filter. It could also be condensation, or water drops. Clean your lens, filters and blow your sensor. Check again at small aperture F29 or something shooting a whilte wall.
    Thanks a lot for the advice. I will do another thorough cleaning and checking

    But the thing is that, i shot at lower exposure timings, there were no bubbles...

  13. #13
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    Default Re: Small lines and bubbles in Photo, whats wrong?

    Quote Originally Posted by takafan View Post
    Thanks a lot for the advice. I will do another thorough cleaning and checking

    But the thing is that, i shot at lower exposure timings, there were no bubbles...
    at long exposure, esp with small apertures, more things are in focus. when using a large aperture, the DOF is thinner, thus the dust is more out of focus in a sense, and thus goes invisible.
    Nikon.
    Nuff said.

  14. #14
    Moderator daredevil123's Avatar
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    Default Re: Small lines and bubbles in Photo, whats wrong?

    Quote Originally Posted by takafan View Post
    Thanks a lot for the advice. I will do another thorough cleaning and checking

    But the thing is that, i shot at lower exposure timings, there were no bubbles...
    Of course. diffract some light, thats how you see them. The light is weak, so if the ambient light is bright, you won't see it. The aperture is big, you won't see it either.

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