Quote:
Originally Posted by cventer
Hard to tell for sure Peter. I would rule out polar alignment first though. 20 min and 2 or 3 10 point t-point runs and your polar alignment will be dead on.
The fact rotation is not just in corners though has me puzzled. What scope? Any chance it's deflection of scope or guider?
|
A couple of things: I just printed the image and using my high-school protractor, located the focal point to within dammit and it is, indeed, pretty well bang on where TSX took the scope on the slew - about a half degree below (on the image but east I think in reality).
The guiding was by OAG so there's no deflection in it. And the scope is well mounted and secure. It's an ED127 but that probably doesn't matter much. The image scale here is 1.94 as/p and the image is a 2048x2048 pixels square. On a rough calculation, the centre of rotation is a shade under one degree below the centre of the image.
It must be something in TSX.
Peter