New Newsgroup on Yahoogroups.ca
Ed
Begin forwarded message:
From: Ed <epmaj...@shaw.ca>
Date: December 29, 2009 12:15:02 PM PST
To: specialastroopt...@yahoogroups.ca
Subject: [specialastrooptics] Special Lenses for Astronomy
Reply-To: specialastroopt...@yahoogroups.ca
I created this newsgroup in order to obtain information on special
optical lenses like surplus military lenses, ultra high speed
lenses for use in faint meteor recording, direct image on film,
with image intensifiers, etc. I am especially interested in the
Super Farron f/0.87 - 72 mm f.l. lens that was used by NASA/LRC for
a faint meteor spectra patrol back in the 1960/70s. This type of
lens was used for aero imaging, x-ray imaging, and CRT recording. I
have the latter which is designed for 4:1 imaging of a CRT screen.
My question is, can you make this lens focus on objects at
infinity? Does anyone have any information on this lens type? I
can't get it to focus on objects at infinity unless I remove one of
the rear elements. Is this a normal practice or is there another
attachment lens that will provide good focus at infinity?
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