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Re: [ATM] astigmatism as seen via ronchi?

Hi Don,

Monday, March 3, 2008, 5:53:43 PM, you wrote:

DRS> You may also want to check the ronchi screen for plumbness...if the ronchi
DRS> screen is not very close to vertical then the lines will not be vertical
DRS> and they will change angles from inside to outside of focus.

How can that be?. The mirror has no knowledge of what is up and what
is down, or of gravity. Do you actually mean to check that the grating
is parallel to some other reference?

-- 

Best regards,
  Richard in the UK

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