Quote:
Originally Posted by luka
Steve, at the top (12 o'clock) the stars are elongated but less than in corners.
I am guessing less distance from the center = less elongation than in the corners?
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Yes, that's a given. But I'm more curious about how the distortion depends on distance from centre of the image. You probably find a central region that is virtually free from aberration.
From the image you've posted, the star elongation looks like something that could be tamed in processing. I don't know what off-the-shelf software that could do that, but I've seen a lot worse aberrations in consumer DSLR lenses that the manufacturer's software is able correct.