I have one of the Bintel 2x Barlows...perfectly decent enough, I’ve used it for planetary imaging, see here
http://www.iceinspace.com.au/forum/s...d.php?t=175567 .
Your biggest challenge will be tracking...it’s a must once you get into the focal length range where you can see interesting details.
Small SCTs and Maks can be effective planetary scopes because of their inherent long focal length, made longer with a simple Barlow, but the same problem applies regardless....without some kind of motor drive, they’re practically impossible to use for imaging.