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I believe that some of the early 8" versions had poorer quality focusers but these have been greatly improved.
The body of the focuser on the 10"RC is about 110mm outside diameter and the draw tube is about 80mm outside diameter.
The draw tube slides along a stainless steel guide that also acts to help reduce unwanted movements.
The extension rings (the focuser is removed from the OTA and screws onto one or more of these when necessary) are 121mm outside diameter.
I couldn't see any unwanted movement when focusing at Prime Focus through a Meade DSI Pro 2 camera.
My opinion is that this is a stable and good quality focuser. I can't fault it. I can however understand that other more experienced people may have other opinions.
Cheers,
Luke
Last edited by Luke Bellani; 23-01-2010 at 03:42 PM.
Reason: opps that should read "I couldn't see"
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