How can I reproduce these circles of light effect ?

Discussion in 'Beyond the Basics' started by slowpork, Jul 19, 2005.

  1. slowpork

    slowpork TPF Noob!

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  2. Hertz van Rental

    Hertz van Rental TPF Noob!

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    At first I thought it was lens flare - caused by bright lights in shot but there aren't any that I can see, they haven't taken the shape of the diaphragm and they don't follow the regular pattern (dictated by the lens elements).
    My best guess - and last time I saw something similar my guess was right - is that it is crap on the lens. Specks of dust or water causing the flash to flare off them and giving the random pattern of circles.
    The circles vary in number, position and size so I feel pretty confident that I am right.
    It's not something you want to reproduce - and it is, strangely, something that is difficult to get to work on purpose.
    You'd do better to try reproducing it in Photoshop.
     
  3. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    I believe that'd be lens flare. Whenever you point the lens towards a light source and shoot you will get a flare, usually round.
     
  4. Hertz van Rental

    Hertz van Rental TPF Noob!

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    Lens flare from that cause always takes the shape of the diaphragm, which is polygonal.
     
  5. slowpork

    slowpork TPF Noob!

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  6. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    There are some instances when the diaphragm has more than the usual number (5-7) of blades therefore creating almost a circle.
     
  7. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    Oh, wait... These are not lens flare, I should have looked more at the first set. Mea Culpa! I'll take another look to see if I can make out what might cause them...
     
  8. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    That's strange... The positioning of the circles of light I mean.

    This is even stranger, with so many circles, almost feels like it was raining or snowing.. Wow!

    Let me ask what camera, what film did you use? Or was it a digital cam? If film, was it scanned or processed at a local lab?
     
  9. Mitica100

    Mitica100 Moderator Staff Member Supporting Member

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    OK, I think I know the answer. I see that pictures shown were taken using the flash; when the flash is activated, light strikes airborne dust particles that are close to the lens. Thus, the light is reflected onto your CCD and it forms the dreaded white circles. The dust particles are almost invisible to the eye but then consider the fact that they are very near the camera lens and they appear round, with the help of the cam's flash.

    Because digital cameras tend to have a lens with a relatively short focal length, with the flash positioned close to lens and use a smaller aperture when in flash mode, it is relatively easy for this type of problem to occur.

    Digital cameras have lenses with pretty short focal length and most likely a round aperture, unlike the more modern SLRs where the aperture is pentagonal or heptagonal (5 or 7 blades). On top of that, the flash unit sits pretty close to the lens and when triggered, it will make the dust particles appear bright, bigger white circles. When using such camera under these circumstances it will be pretty easy to create white circles on your shots.

    Does this make any sense?
     
  10. Meysha

    Meysha still being picky Vicky

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    It's dust on your sensor.
     
  11. thebeginning

    thebeginning TPF Noob!

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    i'm with hertz. picture with drops of water on your lens will usually get a similar effect. if it were lens flare you would be able to see the aperture (as hertz said - polygonal) and there would be a series of them in a row. these are circles and ovals in random spots, so i would have to say it is dust and water on the lens.
     
  12. fadingaway1986

    fadingaway1986 I Burn Easily :(

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    I had this on one of my photos a while back. I think it was dust on the lens.
     

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