|
You'll notice that the star elongation is at it's worst at upper left, and
almost non existent to the right of the image. Coma would radiate equally in all directions. Coma affected stars gets wider like a fan, not just elongated. I suspect that your camera is not perfectly perpendicular to the optical path. Is that model very heavy? if so, maybe it is sagging a bit, or not a snug fit with the T-ring.
raymo
|