This is the open cluster M37 in constellation Auriga. It is a testpicture, a combination of 9x5min exposures, shot at almost full moon. I figured out the correct MPCC coma-corrector to CCD distance and shot these frames to verify this. The collimation and focus were not perfect. What bothers me most are the irritating dust particles. I just cannot get rid of them, even with calibration flatfield frames shot with my EL panel. For testing purposes the camera has been turned but these pesky particles remain in the same position. They must be on the sensor, no doubt about it....
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