Mauna Loa Solar Observatory Observer's Log 
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Mon May 23 17:04:25 GMT 1994
Year: 94  Doy: 143
Observer: koon

COMMENT: Mon May 23 17:04:44 GMT 1994
Thick overcast, no wind, temp ~45 F, observing unlikely today.


DPMON COMMENT: Mon May 23 20:20:04 GMT 1994
Removed ND filter from tube connected to O2B mount.  Moved O2B 2mm towards
camera (ND thickness was ~6mm).  Tried getting images manually, too cloudy to
set focus.  The Occulting Disk looks fairly well in focus in the N-S axis
but not as good E-W, astigmatism?  Will watch the images throughout a good day
to see if the focused axis changes with bench rotation indicating possible
astigmatism or mount tilt with O2B.  If it focused axis stays fixed (eg, N-S)
then maybe the occulting disk or camera is tilted or O1 is tilted or has
astigmatism.  If the focused axis doesn't translate E-W when changing O2B
focus then the O2B probably isn't tilted.  It might be a good idea to insert
the diffuser then focus the telescope from the Occulting Disk to the camera
using the O2B, then focus the telescope from the O1 to the Occulting Disk
by looking at solar features and moving the O1?  If there is astigmatism with
the O1 then we can focus to favor the E-W axis to keep the active lattitude
band in focus.  Will try the O2B focusing plan on the first good observing
day, then if this possible astigmatism is really a problem maybe we can work
out a plan to fix it.