From:    Ted Tarbell 
Date:    Thu Aug  7,  5:19pm
To:      trace_test@sag.space.lockheed.com
Cc:      
Subject: Post-shake Focus and Image quality

I analyzed the focus tests and Air Force targets taken today.  The setup has
more vibration than previous ones, and as a result the Air Force targets are
not the best ever seen, but the conclusion is that the telescope looks fine in
both focus and image quality.  These were all taken through the UV (B) quadrant
with B amplifier, same as our best comparison data from Palo Alto and
pre-shake.

The standard focus sets using the cross-hair both look very good.  My program
has no problems with cross-hairs at 45 degrees, and the results are:

		CCD Center	Lower Left	Lower Right
Fused Si (WL)
  X-Focus	97		92		96
  Y-Focus	95		92		96
 +45 Focus	104
 -45 Focus	96

Open-open
  X-Focus	99		95		97
  Y-Focus	98		95		96
 +45 Focus	101
 -45 Focus	101


The Air Force target sets show the jiggling of the setup:  sharp frames are
mixed in with ones showing blurring in different directions.  Each of the 3
sets (with the target at the top, right & left sides of the CCD) has at least
one good frame.  The best are top #5, right # 4, and left #5.  The focus fits
say best focus was at # 4 on average.  They all show slightly better contrast
in the bars at -45 degrees on the CCD (normally horizontal on the AF target).
There is still reasonable contrast at the group with period = 2.6 pixels,
although not quite as good as in Palo Alto. 

970807_af_top_5 
970807_af_rt_4 
970807_af_left_5 

Ted