I work in a scientific laboratory and I need to take a picture of a sample that emits low intensity visible light (blue) when an infrared laser (980 nm) is pointed to it.
I am using a filter with an optical density of 8 to cut the infrared light so the camera does not detect it.
I was able to take a good picture of one sample where the blue intensity was quite high. However, every other picture of samples emitting blue (visible with naked eye), appear with white instead of blue.
I exhaustively tried every combination of aperture and exposure time, but I didn't get better results.
Any ideas of how something like this can be done?