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Looking at the size of that smudge I would say it would be very close to the CCD chip, possibly on the chip cover glass.
This is the formula for working out exactly where it is,
Smudge Distance from CCD chip (mm) = pixel size(microns) x smudge diam (pixels) x focal ratio / 1000
Those test images looks OK Tony, though with Startools I would have expected richer colour on Eta C ( maybe not enough subs). I'm lazy and I use Startools as well and I'm reasonably happy with the program, I get much better results than previous techniques I've tried.
Cheers
Bill
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