[APML] A question for you ST-4 experts

[Alan Voetsch <alanv12952@yahoo.com>]

Hey all,

I've got an autoguider calibration question I want to lay on you guys.

First, some history. I've used the Meade 201XT (Rich Michaels; where
are you now?) on my LXs for quite awhile. There has been past
discussion that increasing the calibration numbers will result in
better, smoother guiding. I tried this, and it worked on the 201 and
LX200 mount. Somewhere in the MAPUG archives is an article I submitted
regarding this issue. Ralph Pass is the one who originally suggested
doing this, it also worked for him.

I wonder if this is worth pursuing on the ST-4 and G-11. Has anyone
checked this out and were there any results worth mentioning? I
currently start calibration with the star roughly centered and use '20'
for calibration numbers at 820mm focal length. That moves the star to
about '75' and '15'. If I started with the star at '15' and '85', I
could use '40' as the calibration entry and keep the star on the chip,
and have twice the movement during calibration. Hopefully, this would
improve guiding performance.

OK, any insights at all out there?

Thanks,
Alan

SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102
& http://www.pbase.com/avoetsch12952/takpf

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