Sunset in Kruger

by MrFrench

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I am using a filter with an optical density of 8 to cut the infrared light so the camera does not detect it. You should be using a filter that blocks IR, but passes visible light. Ordinary neutral density filters work more or less the other way around. However, every other picture of samples emitting blue (visible with naked eye), appear with white ...


A Bayer sensor has red, green or blue filters in front of the individual sensor elements. A point source will only hit one element. A Bayer array cannot determine color in this case. A Foveon sensor detects the three colors at each sensor element. This should work.


I have seen the same problem when photographing a red laser spot, the spot came out white, not red. In my case it was an exposure problem, the small intense dot on a dark background, the dot was severely overexposed.


As John states, the camera may be compensating for the monochromatic light, or it could be saturation, if the point is much brighter than the background. Have you tried intentionally underexposing, i.e. set compensation -2 or more EV? Have you shut automatic white balance? You might also include a print of the spectrum in the photo, lighting the paper a ...

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