From: xxxx
To: John Lenard
Subject: Re: ISS photo
Date: Wed, 17 Jan 2007 17:57:34 0000 (GMT)
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xxxx FInstP ScD
Professor of Experimental Philosophy
Institute of Astronomy
Cambridge University
Madingley Road
Cambridge CB3 0HA UK
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Hello again,
And again my congratulations on your superb astrophotography.
You are clearly getting some images at almost the diffraction limit of your telescope. In the very sharpest images there are hints of diffraction rings visible on the edges of the satellites. That is of course the absolute limit of optical performance, and is only rarely attained.
Interestingly, the process you have, of using a high-quality imaging system, with fast read-out, and then selecting the rare `perfect’ images is something which has been developed and applied somewhat by one of my colleagues here. You might like to look at our local web page presenting som
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