I haven't really found any advantage to using filters when looking at planets. In my opinion there is more to gain by using a better quality eyepiece rather then trying to pick out detail by blocking out light, other than a moon filter for making Luna a little easier on the eyes. Now deep space objects on the other hand, that's where something like a city light suppression filter (cls) or an ultra high contrast (uhc) filter really comes in handy for picking out the faint fuzzies. It's probably worth picking up a good quality uhc filter from Astronomik or Baader you might just find you never take it out.
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