Re: Igram Artifact


Sorry George, I am not a mirror maker, or Astronomer, just a technician who calibrates Flats!!

Kind regards,


From: <> on behalf of George Roberts (Boston) <bb@...>
Sent: 30 April 2020 17:30
To: <>
Subject: Re: [Interferometry] Igram Artifact
I think you misunderstand John.  I was implying that both the test and reference beams are bouncing off the mirror front.  I'm not sure how to get the reference beam to come back through the diverging lens without also having the test beam aimed at the mirror - so I think having both beams bounce off the mirror front is a requirement.

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