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Filters
Basic color filters for planets:
yellow (#12 or #15)--Moon, Saturn's rings, Mercury, Martian dust storms
Blue (#82A or 80A)--Jupiter, Saturn's disc, Venus, Neptune in big scope, clouds on Mars
Red (#25 or #23)--Mars dark markings
Neutral density--Moon, Venus.
Magenta (#30, #40)--see dark markings on Mars AND clouds. You'll have to go to a camera shop and adapt a lens filter to a telescope filter holder. But it's worth it. This is possibly the best filter for Mars that exists.
Green (#56)--Moon or Mars' polar cap and light details.
Hope that helps.
Don
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