I have been using polar alignment with sharpcap for a while now.
I use a 50mm F1.8 lens with a 5mp sony IMX326, FOV is around 4degrees and the whole procedure runs usually very smooth.
While it seems to get PA pretty close (below 1minute on both axis), I noticed some strange things with sharpcap's PA and was wondering if errors might come from field distortion in the lens used.
After rotating by 90degrees, i align both axis and then I do a sanity check by rotating forth and back 180. What I see is that often the calculated PA error jumps (by 1 to 2 minutes) when a different star is picked or when the star has moved enough in the image.
Since everything is rock solid on the setup, I would assume that flexing is not the main suspect here, but maybe field distortion.
Would it make sense to add support for distortion polynomials to try to reduce this effect?
Anything that doesn't fit into any of the other forums
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