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Beautiful camera. The 4.1mp chip is a delight and there are many awesome images on the net from that one. Starlight Express make an awesome camera and seemed to lead the way to these almost "noiseless" cameras.
Tilt seems minimal, looks like a tad on the bottom left but it could also be vignetting of the stars. Out of focus at corners would mean the field is not flat. That to me would indicate that you are not 100% at the correct metal back distance for the chip from the MPCC. All correctors have a metal back distance. Metal back distance is the distance between the last metal edge of the corrector to the plane of the chip. It then requires a correctly made screw adapter to match that distance for it to work correctly.
Correctors have a tolerance as +/- in mms. That may be down to about 5mm accuracy required and shorter for faster scopes.
A squared off bottom to a star is perhaps vignetting which is not the same as out of focus. I have seen that myself when imaging at F11.2. That would be solved by having all openings large enough to not cramp the light cone including the filter size or distance from the chip.
I see with the 8300 chip for example you can use 1.25 inch filters but not on faster scopes where the light cone is at a sharper angle.
Greg.
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