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From: jorge@bocklin.UUCP
Newsgroups: net.rec.photo
Subject: infrared photography
Message-ID: <107@bocklin.UUCP>
Date: Fri, 5-Apr-85 13:04:07 EST
Article-I.D.: bocklin.107
Posted: Fri Apr  5 13:04:07 1985
Date-Received: Sun, 7-Apr-85 10:32:20 EST
Distribution: net
Organization: Dept of CS, U of Arizona, Tucson
Lines: 19


  I want to try infrared film for the first time.  I understand that infrared
is focused differently from regular B&W film.  Some modern lenses ( if not all )
have a red dot to show where the focusing should be set at. My lenses, Leitz
from the M3 era do not have these markings.  Any net-landers know of any rule
of thumb to do this ?  Or computations to determine corrected infrared focus ?

 Also, if people could suggest films, maybe there isn't a whole lot to choose
from.

 Thanks in advance !

-- 


 Jorge Daniel Ochoa-Lions  jorge@arizona

 Computer Science Department
 University of Arizona