Repost-STL-11000 Internal Guide Chip Will Not Guide In Maxim???


Oct 10, 2006

 


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#26334 Oct 10, 2006

I posted this last saturday morning but got little response so I'm trying

again.



I just had a perplexing experience with attempting to guide with the internal

guide chip in my STl-11000 camera. Basically it would not calibrate and

usually not recognize guide stars that were visible in the guider window after

exposing.



I've been using this camera for about a year but have been primarily using

the remote guide head and an efinder with Maxim. I've done many hours of data

acquisition with this arrangement to guide either my AP155 or Traveler on an

AP1200GTO mount and had no problems whatsoever.



This time I was trying out the camera on a friends 10 inch Newtonian setup

using the internal guide chip.



Here are some specifics:

Maxim 4.56 (I think the latest?)

10 inch Newtonian with coma corrector.

AP1200GTO mount

SBIG STL-11000M with AstroDon filters, although Luminence was used.

Camera set to use the internal guide chip.

In Guide tab, exposures made with stars clearly visible.

When calibrating, specific stars were chosen manually and allowing automatic

choice.

Because this is a fast Newtonian, the stars did exhibit some coma and had the

'seagul' appearance.



Results:

Results varied, but usually calibration was attempted but position values

displayed were often 0, 0 or no guide star found displayed. Sometimes calibration

would proceed through several movements but the displayed track was all over

the screen at weird angles.



We changed the calibration times for X and Y with little success.



More perplexing is that we put his ST-4 in the off-axis guider port and it

guided perfectly.

Then we put the Remote Guide head in the off-axis guider port and it did

calibrate and guide although not as well as the ST-4.



Any ideas?



Kent Kirkley







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