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[ATM] Lateral Wire Test

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Subject: [ATM] Lateral Wire Test
From: aneves <aneves@snowsoft.biz>
Date: Tue, 11 Apr 2006 08:48:30 -0400
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		Hi All,

I've been playing a bit with the LTW to test a 12.5 F4.7 mirror but I am not getting consistent results. Could some of the list experts on this test give me some advice? My doubts are:

How far inside focus should I take my readings?
Is a wire diameter 0.08mm good thin enough?
How critial is the measuring of the mirror to wire distance and the ROC?
What are the main source of error to watch out for?

I am using a digital micrometer with a 1 micron resolution on a home made aluminium caustic tester, but I am not sure of the actual movement of the stage correspondding to the micrometer reading. 

Regards,

Alfredo


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