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Hi jps, I found a red filter invaluable on Mars around opposition - really helped to bring out surface detail for me.
A neutral density filter is very useful on the moon to reduce glare. I haven't experimented on Saturn and Jupiter yet, but I have no doubt that they will make a difference under certain conditions as Robert_T has commented or to view particular features (see the excellent link by barees63).
All my filters are the cheap, GSO filters from Bintel (Andrews probably sell the same brand) and I find them quite satisfactory.
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