Keith Johnston |
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Spots on Flash Picture
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Alvin Power Lifting
Keith Johnston
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Last weekend I took pictures on some power lifters in a gymnasium. I have a Nikon D1H and was using a speedlight SB-50DX flash unit. About a dozen of my 400 pictures came out with circles of light spots on them. At first I thought that maybe water had splashed on my lens right before I took the picture, but I since I had a dozen pictures with this problem, I ruled that out. There were other photographers taking pictures, could their flashes have caused the circular spots on my pictures?
February 24, 2004
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Jon Close |
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Not positive, but it seems to be a problem endemic to digital. It is caused by either dust on the sensor, lens flare in the microlenses above individual pixels on the sensor, or a bad pixel on the sensor (which would shoe in the same place in each photo).
February 24, 2004
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Jon Close |
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LOL
should be "show" not "shoe" :D
February 24, 2004
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Keith Johnston |
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Floating dust particles may cause white spots appearing at different positions on pictures taken by a digital camera using the flash. Dust in front of a subject reflects the strobe light and the image of the dust is captured out of focus. Dust, snow, rain, pollen, condensation, or any small airborne particles may cause the same problem. This problem may also influence compact film cameras. This problem will occur on most compact cameras with on-board flash systems positioned very close to the lens. The photograph will exhibit the nearby dust particle to be light and big because it is out of focus, and to be round as the shape of the aperture. The particle will appear light and big because it is out of focus; it may assume a shape similar to the aperture of the camera, usually round. Particles in the distance will appear dark and very small because it is in focus, it will not be recognized on the photograph.
February 24, 2004
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