M31 Widefield

[andyboy1970]

[michael.h.f.wilkinson]

Nice image. I do seem to see some field rotation (or is there a problem with coma or astigmatism in the lens). Field rotation is more likely, as the effect seems to be centred on M31, and you were probably guiding on a target near its centre. Optical errors would tend to be centred on the centre of the image

[andyboy1970]

I think it was caused by Nebulousity 3 during stacking or de-bayering, its the first time I have used it and the stars to the left seemed a little bloated afterwards.

[michael.h.f.wilkinson]

Looks like the stacking did not cope with (slight) field rotation between subs, in that case