IIS user and imager, Al Sam - had a handbuilt CF tube f10” f4 Newt on his EQ6.
It was belt modded & hypertuned, and he regularly did 1hr subs with it and the results were perfect!
When he eventually upgraded to a Paramount, I purchased his old EQ6- which I’m delighted to say is still going strong with all of my scopes, punching well above it’s weight for $ value.