I recently took the time to perform a CCD drift polar alignment of my CI-700 GEM. At the same time, using the autoguiding error chart in MaximDL I checked the periodic error of the mount. With autoguiding OFF it appears to be 10 arcseconds peak to peak E/W with a 3 arcsecond peak to peak N/S error. With autoguiding turned ON, with an SXV-H9 autoguider, the error is reduced to 2 arcseconds E/W and N/S.
How does this compare to other GEM mounts currently being used for CCD imaging, with autoguiding and without autoguiding?
The CI-700 is mounted on an 8" permanent pier (with lots of concrete underneath) and carries an FS128, FS78, and FS60 in an over/under configuration inside a building with a slide off roof.
So, what periodic error are you seeing?
Thanks
Steven Jindra
How does this compare to other GEM mounts currently being used for CCD imaging, with autoguiding and without autoguiding?
The CI-700 is mounted on an 8" permanent pier (with lots of concrete underneath) and carries an FS128, FS78, and FS60 in an over/under configuration inside a building with a slide off roof.
So, what periodic error are you seeing?
Thanks
Steven Jindra
