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
|
