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The field of view at high power on the planets in a Dob is not the problem but keeping it in the centre of the field to eliminate coma from the outer field is. Yes it helps tracking having a bigger field but it can be done if the tracking is smooth and you don't go over board with the magnification .
No matter which EP design you use you are going to have to keep the object centred for the best corrected view in a Newtonian unless you have a Paracorr.
As I have said before with EP try before you buy or at least have the option to return or swap.
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