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A new optics for the slit viewer was installed at the begining of
December 2004. This optic is designed to be able to see a 4x4
arcmin field in order to see the whole slit. The old Cryocam is now
removed and the new CCD can be operated below UltraDas. This is a large
improvement as the CCD and control is much better than Cryocam and
easily to operate in particular for the TOs. Also the images can be
stored in the usual way.
Dome flat-field images were obtained. The three images shown below were
takken with the dekker in position 6, 7, and 8 respectively (the clear
positions of the "normal" dekker unit). The images show the
circular slit unit with the slit in the center. The slit unit is
vignetted by the dekker one. Dekker position 7 is the best suggested
position. The vignetting produced by the dekker suggest also to use a
window in the y direction during operation.
The vignetting observed in the upper-left side if the image is due to
the polarimetric unit and in principle we should survive with.
Dekker 6
Dekker 7
Dekker 8
