#26334 Oct 10, 2006
I posted this last saturday morning but got little response so I'm trying
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
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.
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
Because this is a fast Newtonian, the stars did exhibit some coma and had the
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
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.
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