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[ATM] refractor aberration

To: atm@atmlist.net
Subject: [ATM] refractor aberration
From: mjlazo@ifsc.usp.br
Date: Tue, 20 Nov 2007 23:13:41 -0200
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Hello,

I was evaluating a vintage UO 80mm refractor thought star test and found a
strange aberration. The objective lens show a small amount of astigmatism and
in focus the star has one side red and the other blue. Its color is not from
atmosferic dispersion since it is present even on star near the zenith and on
an artificial star test i did. Can it aberration be produced by a non correct
spacing between the lens?
Thanks,
Matheus Lazo

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