MDM Trouble Report for 2011 Feb 25

Telescope: 2.4m
Observer(s): Kreckel & Miller (Columbia & U. Michigan)
Instrument: CCDS

Problem(s) Encountered:
We encountered problems with the focus, as what is focused in
the acquisition camera (in the reflection off the slit) is not 
focused on the CCD image.  This is seen as one target producing
two spectra at different locations along the slit, presumably
because it is defocused into a donut. The difference in focus was 
70-80 focus units.  We checked that there were no filters or 
prefilters on the slit and the clear (not the empty) filter was 
selected on the acquisition camera. We then called Bob to see if 
there was anything we could do ourselves to fix this but it 
seems there isn't.  We did manage a work around, adjusting the 
focus back and forth a lot to move items into the slit and then 
refocus to take science data.  This worked OK as we have only a 
few targets and long exposures, but we lost a fair amount of 
time and may not have aligned faint targets in the slit very well.


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Submitted on 2011 Feb 26 [6:42:20]