Archived posting to the Leica Users Group, 2000/02/12

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Subject: [Leica] Re: Konica Infrared 750 answers
From: Jim Brick <jim@brick.org>
Date: Sat, 12 Feb 2000 09:44:30 -0800

George,

Thank you very very much for the in-depth, detailed answer. It is very much
appreciated.

:-)

Jim

>At 11:20 PM 11/02/2000 -0800, Jim wrote:
>>I have some questions. I bought some Konica Infrared film to play with. Has
>>anyone out there used this film? If so, what sort of ISO does it have? 25?
>>50? and what did you soup it in? D-76 1:1? Rodinal?
>>
At 07:15 AM 2/12/00 -0600, George Huczek wrote:
>Reply:
>
> The following is part of some information I sent to a friend 
>> along with a few rolls of 120 IR 750, which might help you. 
>> With EKC IR film, polarizers will have some effect though 
>> minimal, since sensitivity extends to 1000 nm, and the lack of 
>> a anti-halation layer permits burn-outs anyway. There is some 
>> effect with IR 750, since the sensitivity is closer to red, 
>> especially with the 25A filter, however, I'd suggest not using 
>> it... sky and cloud contrast will be very high without it, and 
>> the results might be more desirable.
>>  
>><snip><snip><snip>  
>>
>> A good book to look at, though very simplistic and geared 
>> toward Kodak only, is Joseph Paduano's "The Art of Infrared 
>> Photography"... don't buy it... use the library.  See also the last
>> issue of Photo Techniques, with information on IR metering.
>>                     
>> (Note: If you are metering TTL with a 25A filter, you could set 
>> the EI to 64, which should give a sunlight exposure of 1/8 @ f/16 
>> which is equivalent to Konica's suggestion of 1/60 f/5.6.) 
>> 
>
> _
>[o] -GH
>