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PSF and focus offset between the CCDs:
Data: 13 through focus images with 20 seconds integration through R-band filter. Each CCD have about one hundred stars. The table below summarizes the through focus test results.
MOSCA through focus
CCD Best focus FWHM (pixels) at 23270 gradient in FWHM
Bottom left CCD7 23271 2.59 0.5 pixel in X
Bottom right CCD10 23272 2.36 no
Top left CCD12 23287 2.61 0.4 pixel in X
Top right CCD11 23285 2.48 0.4 pixel in Y

Fig 1: Through focus


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