[sac-board] Mirror Test Results
- From: "Jack Jones" <spicastar@xxxxxxxxxxxxxxx>
- To: "AZ SAC MAIL LIST" <SAC-Announce@xxxxxxxxxxxxx>,"AZ SAC Board" <sac-board@xxxxxxxxxxxxx>
- Date: Wed, 21 May 2003 19:41:34 -0700
Paul Lind has completed testing of the uncoated Schwaar mirrors and the
results are as follows:
Unsigned 14.5" mirror, R=148.5"
Three Foucault tests were done for four zones. Each test was analyzed by
computer curve fitting. Average calculated surface error is 0.068, or
1/15 wave.
An Offner null test was performed and this indicated a very good null
with very faint zone about 1" from the edge. This is not serious and
could not be seen in the Foucault test. The null test could easily
detect a zone even on a 1/15 wave mirror.
Signed 14.5" mirror, R=140.6"
Four Foucault tests were done for four zones. Each test was analyzed by
computer curve fitting. Average calculated surface error is 0.110, or
about 1/9 or 1/10 wave.
An Offner null test was performed and this indicated a very good null.
Paul Lind has purchased the signed mirror. I am lowering the price of
the other mirror to $900 and offering it here before it goes on
AstroMart and Ebay (for $1000). Proceeds go to SAC. Coating runs $150 or
so.
Jack Jones
Saguaro Astronomy Club
Public Events
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Messier Marathon Co-coordinator
Phoenix AZ
spicastar@xxxxxxxxxxxxxxx
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