Quote:
Originally Posted by toryglen-boy
ya think?!?!? 
i would say that for visual astronomy the F ratio is still important, maybe not as important as photography, but still rather important anyway
The F "size" will help to govern such things as eyepiece magnification, field of view, the actually physical size of the OTA, on a reflector it will have a big input on how easy it is to collminate your scope, and how much coma it suffers from, and on a refractor it has alot to say about the amount of CA.
i would say get as short as possible without compromising on quality, for a reflector i wouldnt get anything shorter than F6, anything less and colmination has to be exacting, and coma might start being a hassle, although the trade off is a wider field, and a more portable scope.
its up to you !!
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I agree absolutely but I was trying to be relatively simplistic and only considering the actual view through the scope,