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3 for sure. Bahtinov Mask is too coarse. With experience you'll be able to judge your focus based on features on the planet and/or the limb. Jupiter is quite easy. Especially if you have moons in the field. Saturn the rings and cassini division are there for that. Mars can be a little tricky but with time you know what to look for. Most capture program can stabilize the planetary disc so you don't have to follow a jumping ping pong ball.
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