Re: Leica & IR

[Gary Beasley <beasleyglb@xxxxxxxxxxxxxx>]

At 09:26 PM 1/7/98 -0600, you wrote:
>> You may notice that there is no infrared mark on your Leica lenses.
>> There was none on my dual range Summicron or the 35mm Summicron.  I
>> always thought that since Leitz does not mess around with doing things
>> half-way, that that must mean that those lenses were corrected for IR
>> also.  Does anyone know whether that is true?  It's a very appealing
>> theory, anyway.
>
>According to a friend who is a Leica enthusiast, Leitz does not recommend
>any focus correction for IR film. I forget why that is true with their
>lenses, but you are right about Teutonic precision. The focusing correction
>was deliberately left off because they do not recommend compensating.
>Exactly why is still a mystery, but I believe an old Leica handbook may
>hold the reason.
>
>Russ Rosener
>Washington University, St. Louis.
>http://ascc.artsci.wustl.edu/~rrosener/
 
It seems a test is in order! Lay out a scale in the yard and put a stake on
a center point. Focus in visible light and shoot. When printed this should
give some indication of the accuracy of the focus.
Gary Beasley
beasleyglb@xxxxxxxxxxxxxx
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End of Infrared-Digest V0 #340
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