Date: Fri, 28 Jan 2000 23:36:32 -0700
From: Russell E Owen
Subject: SDSS M2 collimation 1/28/00
The SDSS secondary cage was moved approx. 5 mm away from the primary
for better focus.
The new SDSS M2 collimation coefficients and data are:
New coefficients
                  const     sin(alt)  cos(alt)
SecXTiltCoef       5.0       0.0       0.0
SecYTiltCoef      -5.0       0.0       0.0
SecXTransCoef     50.0       0.0       0.0
SecYTransCoef   -466.9     141.9     538.0
Old coefficients
SecXTiltCoef       0.0       0.0       0.0
SecYTiltCoef      -5.0       0.0       0.0
SecXTransCoef    -50.0       0.0       0.0
SecYTransCoef   -212.1     -54.8     321.8
New data
alt	xtilt	ytilt	xtrans	ytrans
(deg)	(")	(")	(um)	(um)
30	5	-5	50	70
60	5	-5	50	-75
90	10	-5	50	-325
We didn't get good data at the horizon. I suggest we redo the
collimation data collection if we get some time.
tinst:default.dat has been updated.
-- Russell