Just to explain further: I've seen that phenomenon when shooting in rainy or dusty environments. Out-of-focus particles suspended in the air (close to the camera) can bounce light, causing that effect when using flash fill (or when someone alse behind the photographer is firing a flash while "our" camera is taking a long exposure).
Dario

----- Original Message ----- From: "Dario Bonazza" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Monday, November 23, 2009 1:37 PM
Subject: Re: Circles on digital images


Flash light reflected by droplets/dust floating around.
Dario

----- Original Message ----- From: "MikeM" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Monday, November 23, 2009 12:56 PM
Subject: Circles on digital images


A friend asked me what could be causing the circles on his photos such as the one on Flickr. Other photos in the series had a number of smaller circles that are in different positions on each photo. Any suggestions what might be causing it?

http://www.flickr.com/photos/35877...@n03/4127152735/

Thanks
Mike


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