Re[2]: [ATM] Question about "Null-testing"

[Richard <cnc@cncservo.co.uk>]

Hi Bob,

Monday, July 4, 2005, 6:47:31 PM, you wrote:

BM> Like any other test, the Ross and other null tests can lie to you if you
BM> allow them to do so.  The test is still a variation of the Foucualt test

How so?

BM> Using interfrometery (there's a Yahoo group for that which is fairly active)
BM> that will show errors a lot better than what the geometric tests like
BM> Foucault and so forth.

Exactly, but that's the way a Ross null test is done. I assume
you know of a method of using a Ross null lens with a Focault
tester that I don't. If that is the case, the immediate question
it would pose to me is what effect would the off axis effect of
Focault have on the results?

-- 

Best regards,
  Richard in the UK



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