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Do you have a barlow Tim?
With your focal length a x2 barlow would be all you should need for a while I'd suggest. There will be plenty to figure out with focus, data collection (highest possible frame rate), and image processing before you worry about even more focal length.
I used to piggyback two 2x barlows before I got a powermate, but my FL will be half yours I imagine.....
(note I'm hardly a planetary guru, but have got a few decent shots over the last couple of years like this as per gallery below)
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