From: Alan Friedman <alan@greatarrow.com>

Date: October 21, 2005 4:16:08 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: Grid Pattern

On Oct 21, 2005, at 5:51 PM, Tim wrote:

Since my 9.25" is mounted in the roof of my house, I'd have to run up and down the ladder 

to fine focus, so I sought a motorized focuser.  After looking at the various options, and 

realizing that most (all?) of the motorized crayfords probably have cords  that are too 

short, I bought a Robofocus. 

A good focuser is a must. My 10" mak has a beautiful belt driven moving mirror mechanism which works very well - but I found that in the middle of winter it was really difficult to move. I bought a feathertouch crayford with the dual speed pinion - it was a huge help. At f48 for jupiter the CCD chip covers a couple of arc minutes. Any image shift is no fun. The robofocus has an excellent reputation too but I try and have as few electric things around as I can manage!  

Alan