[meteorite-list] [specialastrooptics] Special Lenses for Astronomy
From: Ed Majden <epmajden_at_meteoritecentral.com>
Date: Tue, 29 Dec 2009 12:48:20 -0800 Message-ID: <9D94854B-1D4D-4AEB-8930-0D804A7D305F_at_shaw.ca> New Newsgroup on Yahoogroups.ca Ed Begin forwarded message: > From: Ed <epmajden at shaw.ca> > Date: December 29, 2009 12:15:02 PM PST > To: specialastrooptics at yahoogroups.ca > Subject: [specialastrooptics] Special Lenses for Astronomy > Reply-To: specialastrooptics at 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? > Received on Tue 29 Dec 2009 03:48:20 PM PST |
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