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Something ain't right here. Even a miscollimated 10" will clearly show rings and a separation between the planet and rings. Especially since you saw a pinpoint star (probably Titan actually) in the same field.
Correct focus for planets is the same place as for stars - I have no idea what the previous poster actually meant when he suggested otherwise.
Learn to collimate by all means, but if you take the eyepiece out of the scope and can see the primary mirror (big one) more or less entirely in the secondary ( little one) then your problem is likely to be the eyepiece.
Try a bit more power - if you have a fast 10" you will probably want a 5mm eyepiece for planets.
Cheers
Andrew.
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