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I'm with Rob, I seldom use one.
I have a selection of Zeiss filters, both in a filter turret, which screws onto the top of each eyepiece, and also single push on filters.
Colours are anything from ND through light yellow, orange, red, blue, and green. There are specific "Marsglas" filters as well, and these are very good. I have used these Marsglas filters last time round, but with the likes of Jupiter found no filter all I needed.
Best bet is to try a few before you spend.
If 2" is where you are at try an older camera store, and get good quality 48mm screw on filters, these fit you 2" eyepieces, etc. I use an orange one with the bino viewer when bino viewing the moon.
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