Posted 07 May 2013 - 10:50 PM
Posted 08 May 2013 - 12:32 AM
The bases are available in sizes that fit the tubes curve.
GSO Crayford Focuser for Reflectors - Single Speed
GSO Crayford Focuser for Reflectors - Dual Speed
Choose the one u want from the selection menu.
The single speed focuser should work well with a f/8 scope.
Posted 08 May 2013 - 05:17 AM
I have a 6" reflecting Newtonian telescope my father and I built from scratch when I was a kid. I am looking now to make some updates to it now. I have seen some crayford type focusers listed here, 1.25" and with curved base. How much does the tube/mirror size (6" vs 13") affect the fit of the focuser to the tube? In other words, can a focuser used on a larger scope, still fit and work on a 6" one? Just want to make sure there isn't something I am missing and don't want to waste my money with something not compatible.
You do need to make sure the focuser base fits the tube, that can be a problem with a smaller scope. If the tube is robust, a focuser made to fit a larger tube can be used by using washers between the focuser and the tube but it's better to have a focuser that fits.
Also, you need to make sure the focuser height, that is the racked in focuser height as well as the travel will allow the scope to come to focus.
Posted 08 May 2013 - 07:44 AM
Posted 08 May 2013 - 08:58 AM