Four bright X-ray distant clusters detected in the RASS - including A1300 - have been observed during a 4 night run at the 3.6 m CFH Telescope in May 1993. For A1300, medium deep images were obtained in the B and R bands as well as 3 spectroscopic masks, each containing about 30 slits; two of them were centered on the main cluster body and the third one on the northern X-ray sub-clump. Observations are summarized in Table 1 (click here).
The focal reducer MOS/SIS together with CCD Lick2 (
pixels of 
) were used during the run. This CCD is a thick device having a quantum efficiency of
in the blue. The observing configuration provides a pixel size of 0.314
over a field of
view of about 10
.
The overall image quality was good (stellar FWHM 
) although
some optical distortions were conspicuous near the edges of the images due
to the optics of the focal reducer.
A control problem in the reading of the CCD, namely the random addition
of null pixel values, was unfortunately discovered after the A1300
observations. The resulting main effect on the data is to mimic a
misalignement between the grism and the CCD
columns such that the dispersion direction appears tilted with
respect to the CCD columns whereas the image of the
slits remain perfectly aligned along the rows; this can be easily corrected,
however, the final spectroscopic resolution in somewhat altered.