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What is this dust orb problem ... I don't realy understand what that
is ....
Alright, let me try to explain it. It's rather complicated, and actually occurs with many cameras, but rarely for most. It was however, very common in flash photography for the Canon SD870.
What it seems to be is reflected light that comes to the image sensor on cameras from dust particles that are airborne, in the frame of view of the camera, and within the influence of the flash. (Probably generally limited to about 15 feet, but maybe more, depending on the darkness of the scene, and depending on the camera. Anyway, these dust particles cause the reflected light to appear as "images" that seem to be circles or spheres in the photo when the flash fired, because of low light. They disturb the appearance of the image, and sometimes ruin it, if there are several orbs, depending on just where they show up. They can be in front of the subject, for instance, a person, distracting from the intent of the photographer.
What causes them? That's the complicated part, that even the camera makers cant resolve. That is, they can't make a camera that absolutely won't produce them in a flash photo. But, some cameras are more prone to causing these orbs. The Canon SD870 has become famous for it. Thus the extended forum conversation about the new SD880, and does it have the orbs issue? Seemingly not, up to this point, and from my experience.
I hope this helps you.
Glenn
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Alexander...our wild child
Canon S2, A610, SD880