Re: [APML] Focusing an ST-4

[Herm <hermperez@worldnet.att.net>]

I do the same, but I scratched a line around the draw tube at the proper
focus position.. I do retract the focuser for transport since I dont want
to bang it against anything. Focuser rigidity is 90% of what makes a good
guidescope good, maybe 99%.

"Michael Stecker" <mstecker@dslextreme.com>  wrote:

>If you use a guide scope like the 80 mm Astro-Physics, you only have to
>focus it once on a star and then lock the focus with set screws (also works
>for some off-axis guiders when used with a set ring sold by SBIG).  I did
>this and photographed for three years without ever refocusing the ST-4.

Herm
Astropics http://home.att.net/~hermperez

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