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I have both on my C9.25 . I have a Feathertouch micro focuser and a Meade motorfocuser hooked into a JMI serial -> USB convertor into software that runs the focus motors.
With a Bhatinov mask - getting focus for visual work is child's play. Too the Feathertouch reduces mirror shift by a significant factor. Without it when I changed direction of the focuser a star might jump a degree or two around the eye-piece! With the Feathertouch its less than one third of this movement.
Once I have close focus I simply snap a series of shots and focus in and out (using the Meade focuser and moving the focus point by microns I suppose). I then inspect the resulting picture of the Bhatinov masked star, looking whether the central spine is a pixel or two low or high. Generally I prefer to not touch the scope at all when its doing anything related to imaging - including the focus set up.
My thoughts,
Matt
Last edited by g__day; 16-02-2009 at 12:00 PM.
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