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I understand that you don't need a coma corrector for planetary photography with a newt, because theoretically, the planet stays in the center of the field of view, where there effects of coma are not apparent.
Which requires a tracking mount, of course.
I have tried using a manual dob the way you intend to and gotten some reasonable results, but it is a bit frustrating. Obviously, there is the constant centering of the planet in the field of view, but I could also see the image degrade as the planet passed into the edges of the field, but this may well have been because I was doing eyepiece projection because it was easy to locate the planet by swapping out to a lower power EP.
Anyway, I think the main difference here is that without a tracking mount, the planet will spend a fair bit of time on the edge of frame. I don't know whether coma is an issue for the very small fields required for planetary photography, but I do know that you can increase your chances by editing the videos or limiting the frames in autostakkert, so as to exclude the frames where the planet is not in the optimal position.
Cheers, hope that helps
M
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