Date: Tue, 28 Aug 2001 10:15:39 -0600
From: Dan Long
Subject: Re: 2.5m obslog 20010827 (MJD 52149)
>                       APACHE POINT OBSERVATORY SDSS 2.5M
>
>                                 OBSERVING LOG
>                             Monday August 27, 2001
>
>                                  (MJD 52149)
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>      Bizarre - Mike in his SAOimage window couldn't see a star in the guider
>      11-th fiber, but Jurek in his control SAOimage window saw stars in all
>      fibers - can it be explained (cart 3 plt 666)?
    This could happen if each SAOimage was run from a SOP with
different cartridges loaded.  For this to happen, at least the
SAOimage with the missing star would have to be run in the default (
as opposed to simple ) mode.  The info from the loadCartridge, among
other things, includes information on which fibers are valid for the
plate.  If a fiber isn't used, the postage stamp for that fiber won't
even be cut out and displayed. In this case you wouldn't even see
noise in the position of fiber 11 since no portion of the chip would
be displayed there.
				Cheers,
				  Dan