From: John Swenson 
CC:  atm{at}shore.net
Reply-To: John Swenson 


Jim,
the photo LWT is the way I've been doing it for a while. When you are doing
the test you don't have to visually be precise about anything.

The one problem with this is you need to know the transverse measurement
  of the center of the mirror fairly accurately so you have the proper
transverse offset. The way I do this is to take two images near the center
(one on each side), then do an interpolation from their pixel positions and
transverse measuremnts to find the transverse measurement of the center of
the mirror.

John S.

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