ISO for HIE?

["David J. Carlyon" <david@xxxxxxx>]

Does anybody set an ISO on their camera for HIE?

Here's my experience with Konica 750nm - when I took my first roll, I
forgot to bring the info sheet with me - I'd skimmed it the night before,
and thought I'd read that ISO 64 was the speed of the film, so set the
camera's meter for that (it's a Minolta 500si), and had a red 25a filter
over the lens. I forgot the sheet again when I went to develop it (and
hadn't reread it in the meantime), so guessed (with the help of the lab
attendant) at 10 minutes in Microdol. I was really happy with the roll,
though I was shocked that it turned out at all. 

Before I took the next roll, I read the sheet, and it actually said ISO 32,
unfiltered, so I set it for that, and had the roll developed by another
lab. I took a range of exposures of a single subject (a basillica) - though
the lab's machine scratched my negs (ProColor in Minneapolis - they seem to
do great with color, or b&w prints, but never use them for b&w developing,
as my b&w film invariably seems to get scratched by them during
development), the exposures turned out well enough - some shots were
exposed for the sky, others for the building.

The next roll I exposed at ISO 64 again, and developed it myself, this time
in D76, for twice the recommended time (I figured I was pushing the film,
like I seem to have done the first time). The roll came out good, but much
more contrasty - probably because most of the shots were done in direct
sunlight, while the 1st roll was taken in shade (some of the pics on this
roll were taken in shade too, and those shots turned out okay,
exposure-wise, though since I was taking pictures of kids who wouldn't stay
still, they ended up blurry because of the slow speed.

So I think I've had good enough results using the cameras TTL meter with
the Konica film. When I took my first (and only, so far) roll of Kodak HIE,
I set the meter for ISO 200, and developed it in D76. The contrast was
extremely low - I had to use a #5 contrast filter when printing just to get
a reasonable amount of contrast. I used the recommended development time
for D76. Aside from the lack of contrast, the exposures seem to be
reasonably on target though - should I increase development time? Other ideas?

(You can see results from all of these rolls at
http://scc.net/~david/Photography/infrared.html or go through the front
door to see non-infrared pics too, at http://scc.net/~david/Photography/ ).

David

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