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I can’t see any reason why you would want to put a longer tube dob on a mount when there are more suitable options
1/ Dobs usually come with single speed focusers , you really need dual speed focusers to do any serious AP either planetary or DSO
2/ The longer tube of the Dob on that EQ6-R is going to place unnecessary torque and backlash whilst tracking and guiding than a standard imaging Newt
3/ You can buy an 8” f5 Bintel GSO newt for only $700 purpose built for AP , has a dual speed focuser , is only 820mm long , 300mm shorter than the Dob , will track and guide beautifully ( I’ve used one on an EQ6-R for years )
4/ The Altitude support brackets on the Dob may interfere with the tube rings when time comes to balance the damn thing ( if you remove them you have to block all the holes etc…
5/ Balancing in Dec will be a pain in rear end
6/ An bonafide 8” f5 imaging Newt is a faster imaging system than the dob at f6 therefore collect more signal for the same duration ( only slightly narrower FOV )
To answer you question yes it could be done , but not a viable long term solution for long exposure Astrophotography
I would leave the Dob as a Dob for observing, that’s what they were originally designed for ( not on an EQ mount )
My 2 cents …..
Hope the above is helpful
Cheers
Martin
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