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OK, so here is the good news. You don't have to have a big aperture to get those same pix. In fact you are better off with the suggested ED80 or slightly bigger and all the incumbent guiding gear etc and just taking longer exposures.
I'm using a LUNT 102mm ED F7 refractor and seemed to have finally cracked the alignment\guiding problems and getting better results with no trailing. It is sitting on an EQ6 but only because that was available when I was buying. My 10" Dob which I modified to be able to work on the EQ6 is back on it's DOB base and is unlikely to ever be remounted. The current setup is working well.
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