Subject: looking at mt images

From: heidi@sdssdp1.fnal.gov

Submitted: Thu, 7 May 1998 10:22:10 -0500

Message number: 5 (previous: 4, next: 6 up: Index)

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>Date: Thu, 7 May 1998 10:10:17 -0500
>From: heidi@sdssdp1.fnal.gov (Heidi Newberg)
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>To: sdss-mt@astro.Princeton.EDU
>Subject: looking at mt images
>
>
>        Yesterday I started looking at MT images from mjd50935.
>Half of the images were so far out of focus that the stars were
>doughnuts in the images.  It did not appear that this was due to
>a change in the weather conditions at the site (though that may
>have contributed to the problem).  It was common for the focus
>to be way out, then reasonably in focus for the next couple of
>fields, and then way out for the next couple of fields, etc.  The
>goodness of focus changed most when the telescope was slewed the
>most.  After staring at the data for a while, I decided it was
>likely that the altitude focus correction was not correct.
>
>        I tried to read the MOP tcl code.  It seems to me that the
>focus correction formula is something like:
>
>adjustment = 2.5 (90 - elevation in degrees) - 1.5,
>
>but this might not be right, if I don't understand how all of the
>shells talk to each other.  This equation looks sort of funny to
>me.  Who is the right person to talk to about this problem?  Has
>this been noticed on other days?
>
>                                                        -Heidi
>

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