Re: Kodak HIE and #87C

[Gary Beasley <beasleyglb@xxxxxxxxxxxxxx>]

>Date: Tue, 20 Jul 1999 13:59:16 -0700
>From: "Tolga Yayalar" <tyayalar@xxxxxxxxxxx>
>Subject: Kodak HIE and #87C
>
>Hi everybody,
>I've been using #25 filter quiet while but recently I purchased kodak's 87C
>filter. I've just developed my first roll, I was shocked with the results. I
>had shot the roll on a sunny day with some clouds. In some shots I also used
>#25 filter  just to be able to compare later. The ones that I shot with 87C
>are almost completely black, I can see the image but they are so dense that
>edges of the film is effected too. But the ones that I shot with #25 are
>just as I expected. I used 400iso when #25 is atteched to the lens and 12
>iso with the #87C. Kodak and most people suggest 10 iso with the 87C but my
>camera has 12 minumum. I also developed in rodinal 1+50 12min@xxx This
>combination gave me good results with #25 at 400 iso. I wonder where I did
>wrong. Is it the film speed or developement? I know IR light is very
>unpredictable but what is the filter factor of 87C? Any ideas and
>suggestions would help a lot. Thanks
>
Lets see, you were metering through the filter on both occasions. Therefore
your EI for the 87C is way too low. EI 12 is for metering *without* a
filter. Metering through the filter will probably need an EI around 1000 to
2000, you will have to do trials to find out the exact number. Give it
another try!
Gary Beasley
http://beasleyglb.home.mindspring.com/

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