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Hi Martin,
You could always try to find some filter transmission curves for the ZWO UV/IR filter and perhaps compare them with those of the other filter you are using. If the other filter you use is from one of the major brands, or if you have a friend with a handy spectroscope have it measured.
Other than that you could always try to judge the effectiveness oF the ZWO UV/IR by imaging with and without it and check for any bloated stars, and then do the same with ONLY the other filter fitted.
Best
JA
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