[Startrek (Martin)]

Michael,
The EQ6-R is a great mount , I have two of them , the original version 2018 and the latest version with USB2B port , they will carry up to an 8” f5 newt
Mine carry a 6” f6 Bintel GSO newt OTA and an 8” f5 Bintel GSO Newt OTA both have dual speed focuser and both reach focus with plenty of travel without adapters , just a Canon T ring and a Baader coma corrector. I use both a Canon 600D and a new ZWOASI2600MC cooled OSC camera
If your dob 6” f8 doesn’t work on the mount you can pick up a 6” f6 or 6”f5 Bintel newt for $300 but you may have to get a dual speed focuser fitted at extra cost. Skywatcher also do a 6” f5 newt also with dual speed focuser for about $450 to $500 and a DSLR should focus with out adapters etc.. but I prefer the Bintel GSO brand , better build and better focuser
For Astrophotography you will definitely need a dual speed focuser
For a newt f5 a better choice of focal ratio to start off with AP
Good luck and enjoy your journey
Cheers
Martin