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Originally Posted by janoskiss
The only thing going against Crayfords vs good R&Ps is that they are so smooth they need a lot of tension to hold focus in a refractor with a 2" diagonal + eyepiece when pointing about 45 degrees above the horizon.
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Thats probably why the seconds screw is for locking the focuser once you get it nailed.
I have a R&P on my smaller dob and a crayford on my bigger - no comparison, the crayford kicks the snot out of the R&P in every way!!!
I've also used friend's dobs with upgraded R&P's with all sorts of doodads added to them to help with fine focusing and such. The inexpensive (not cheap) GSO crayford kicks the snot out of them too
