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As CCD's don't use blocking filters (as in DSLR's), you get to see what a camera lens really produces, warts and all, from UV to I/R.
The camera is certainly not at fault, it is simply recording the unfiltered image produced from the lens.
Any off-axis coma, astigmatism and spherical error all become pretty obvious.
Easiest fix is: stop the lens down 2-3 clicks.
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