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I've been lurking on this topic and seen the discussions about image distortion and pixel size.

Greg said: "0.4 moa of a single pixel width for the 50mm / 10 mp". My brother, who's become a DSLR fanatic, leads me to believe that 20 mp would be really expensive. Wouldn't it be possible to calibrate the image distortion of a prime telephoto (are these available/expensive?) in order to get better pixel precision? Maybe a bit like using a 7x scope. I suppose sensor speed is an issue for magnification, just like it's hard to hold a sextant still with the 7x scope. Can we even dream about accurate star sights this way?

I recently surfed up some articles (now lost) on photometry, and this kind of thing is at least well-studied academically.

Richard

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