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It is quite feasible. If the two broadband filters only have a small region of overlap you will get at narrower band of transmitted light when they are combined.
Looking at the site the Baader Fringe Killer transmits greater than 90% of the light between 475nm and 675 nm. A red filter would transmit everything above say 600nm. If you combine them you would get a transmitted band between 600 and 675 nm.
Does anybody here have a Baader Fringe Killer and a red filter and could do some experiments with it??
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