Date: Thu, 13 May 1999 10:01:21 -0700
From: Russell E Owen
Subject: Re: 2.5m obslog 990512 ( MJD 51311 )
>   Some unexpected things happened to guide images once we were no longer
>looking at the whole frame.  That is, when guiding, only the guide regions
>are saved.  Further, only the guide regions which survive the startup as
>valid stars are saved.  This makes for a large headache in guider
>monitoring.  The image size varies with number of guide stars, and which
>guide stars since some regions are larger than others.  It also makes it
>impossible to tell which fibers one is seeing in an image when it is
>chopped up like this.
Sorry about that. I guess I could force the TCC to always take a full
frame. Of course the 3.5m folks are screaming at me to go back to
taking postage stamps. I'm not sure there's an easy solution that'll
make everybody happy, but will think about it. One possibility is to
make sure starting and ending pixel coordinates are specified in the
FITS file (if this is supported by FITS), so that it's easy to
display the image properly centered, or properly marked with each
probe.
>   There is a rotator limit problem with the current spectro setup.  That
>is that every time you go through the meridian the rotator stops because it
>hits the -180 deg limit.  We either need to be able to tell the rotator to
>choose an angle greater than +180 to start, or reorient the plates such
>that a limit is not hit at such a frequent and desirable location.
>Russell, would /rotwrap=positive work for this?
Yes.
-- Russell