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The Bintel eyepiece and filter kit, to me is overpriced and you really don't need the filters. The coloured filters are to help highlight different features on the planets and they do that to some degree but unless you are going to spend a lot of time studying the planets and with the 90mm scope you wont get deep enough detail to justify having the filters for that purpose.
I have a full set of coloured filters and honestly, I hardly use them. A good Contrast Booster Filter would be more suitable for your use as well as 3 or 4 medium quality wide angle eyepieces.
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