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11-03-2010, 11:44 AM   #1
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KX Burst mode problem, uneven lighting or exposure across half of the frame

I was taking some burst photos using 12800 ISO. JPG, 12M, ***, 18-55 zoom, 1/350, and f5.6.

I experienced half of the frame along the long axis was underexposed, or darkened, almost like I was using a gradient filter. When I took single shoots using 12800 there was no problem. The problem would switch from side to side of the frame on consecutive shoots.

The samples show a four shot burst and the problem is clearly visible. In frame IMGP7912, the problem is on the left side of the vertical image. In 7913 it is on the right side. In 7914 its on the left, and 7915 its on the right. If you look at the white wall behind the player, the shading, or gradient effect is clearly visible.

Does anyone have any experience with this, or any suggestions. I have done burst mode in better lighting, and saw nothing like this. It has only occurred under low lighting conditions.

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11-03-2010, 11:49 AM   #2
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That's from fluorescent lights. It generally occurs at shutter speed above 1/30th second. The color of the lights is constantly changing, but at a rate fast enough that your eye perceives it as white(ish). At faster shutter speeds the various colors are captured.

Last edited by Parallax; 11-03-2010 at 12:12 PM.
11-03-2010, 11:53 AM   #3
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I have experienced the same behaviour indoor, with all my lenses. I never experience it indoor.

Parallax is correct: it is the flicker of the lighting. You will observe it with most form of artifical lighting incl. fluos and bulbs.

11-03-2010, 12:23 PM   #4
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Thanks for the answers. This room had some type of sodium lighting I think. Round hanging lights that have to warm up when turned on.

11-03-2010, 02:31 PM   #5
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Sounds like salt lights.

[sarcasm]The exposure is also doing really weird thing with focus, but only on the subject's faces[/sarcasm]
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