Re: Kodak HIE and #87C

["Tolga Yayalar" <tyayalar@xxxxxxxxxxx>]

Thanks for everybody for the responses. I guess I forgot to add that I meter
without the filter when I'm using #87C. I know that this is an opaque filter
and my camera doesn't meter the infra red light. When I use #25 I meter thru
the filter and this works better than 200 for me. According to my
calculations, (assuming that 5 stop compansation is needed) if I shoot w/87C
12iso which would be equivalant to 400iso with the filter on, I would get
good results(ofcourse IR light is unpredictable therefore I bracket 3 stops)
But the results are way too dense. Everybody agrees about the film speed so
I guess I did something wrong somewhere but I don't. I'll probably try
another roll. I'll bracket 5 stops and develop in D76 11 min. I'll post the
results. Wish me good luck :-}
Tolga


----- Original Message -----
From: Joshua_Putnam <josh@xxxxxxxxxxxx>
To: <infrared@xxxxx>
Sent: Tuesday, July 20, 1999 2:54 PM
Subject: Re: Kodak HIE and #87C


> "Tolga Yayalar" <tyayalar@xxxxxxxxxxx> writes:
>
> >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.
>
> Do you mean you were metering through the 25 red, with your film
> speed set at 400?  That's the setting I would normally use for
> metering through a 25 red, and it gives results equivalent to
> using Sunny 16 with a film speed of 50, e.g. 1/60 at f/16 in
> bright sunlight.
>
> If you then tried metering through the 87C, your camera's meter
> would see almost nothing, while the film would receive all the
> infrared that your meter does not respond to.  A film speed of 12
> would be appropriate for Sunny 16, that is, not metering through
> the filter at all.  Your proper exposure would be in the range of
> 1/15 at f/16, but your meter would think there was almost no
> light, and would take a very long exposure instead.
>
> Since most meters don't respond predictably to IR as deep as the
> 87C passes, there is no reliable filter factor for that filter.
>
> --
>  Josh@xxxxxxxxxxxx  is  Joshua Putnam / P.O. Box 13220 / Burton, WA 98013
>                      http://www.wolfenet.com/~josh/
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