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DP, the main problem with the low cost filters (ie coloured glass) is their transmission characteristics - they have a lot of crossover, i.e. the blue filter lets through a lot of green and red, so you get funny results when you recombine to make a colour image.
The expensive filters are not coloured glass, they are something else entirely and use special coatings to let through only narrow bands of light. You can usually rely on these filters to give you images that recombine to make a true colour image.
regards, Bird
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