Quote:
Originally Posted by Joshua Bunn
Hi Bert,
thanks for this.
How did you know it was tube flexure and not ccd non-orthogonality?
could this method be used to find where the ccd is tilted so i can use some shims?
Josh
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The FLI camera is almost perfect as far as orthogonality. It was all flexure.
I took a one hour exposure at the zenith and it was perfect. The whole image train was vertical so there was no gravitational forces acting on it.Bert
Point your system vertical and take an image. Then take an image at about 30 degrees fom the horizon. This will tell you whether you have flexure or misalignment.