how to stop starAlignment from rotating target images

[rockyraccoon]

Is there a way to constrain starAlignment so that target images aren't rotated?
I often find that starAlignment will rotate my images by 0.01px or 0.02px, however there is no reason why the rotation should be necessary (as no physical rotation of the camera has happened during image acquisition).

[Geoff]

If you are not perfectly polar aligned (and who is?), you will get field rotation about the guide star, so the images have to be rotated to properly align them.
Geoff

[pfile]

yeah but i think what rocky's saying is that if the centroids are computed as 0.01 or 0.02 pixels off from the reference, it's probably better to just not register the images at all to avoid any possible interpolation artifacts.

rob

[rockyraccoon]

yeah but i think what rocky's saying is that if the centroids are computed as 0.01 or 0.02 pixels off from the reference, it's probably better to just not register the images at all to avoid any possible interpolation artifacts.

exactly!