This isn't really necessary. If you are focussing manually, try adding a
large diameter knob onto the existing focusser (say, about 1-1/2" to 2"
diameter). You'll find it's a vast improvement.

Chris

Jay S. Curtis wrote:
>
> Has anyone ever designed a vernier secondary focuser
> for the meade SCT - rack-and pinion style to attach to the visual back ??
> That few 10,000's of an inch in or out really would make focusing a CCD much
> easier...
>
> [JSC]

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