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Hi Stéphane,
depending upon the camera that you're using, it may already have an IR cut window in front of the sensor. Some have an anti reflection filter only (like my ASI533MC) but I'm pretty sure that other cameras already have the IR cut built in, negating the need to use one separately.
I've been reading up on LPR filters on and off and there seems to be polarised opinion regarding whether they're useful or not in terms of producing a better broadband image than having no filter. There will be heaps of experienced imagers here who can shed some light on that.
I have a Baader Neodymium filter from before I started imaging and have tried it out. I'm not sure whether the results are better than using no filter. Perhaps it allows longer subs than using no filter. I'll follow this thread with interest.
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