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For visual, I like to use just a ND (neutral density) filter 0.6 is my preference. But with binoviewers I don’t bother as the brightness is reduced.
If imaging, either a uv/ir filter or IR pass filter annywhere around 600-700nm is good and can give more stable results when seeing is poor.
I honestly don’t think there much difference between makes unless it’s some real cheapo and then might degrade your image.
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