well the slightly longer focal length (f8) would give better contrast with planets... hey i didnt say i was dumping the dobbie!!!
its a refractor, so everything that goes along with that i guess. but mainly planets. no obstruction. but being a 6" plenty of clusters and stuff too........
...and stuff...
just throwing some ideas around in my head
I am thinking an f6 is more likely tho... and that would be more portable too