From: Cor Breukel (cor@lumc.nl)
Date: 02/01/00-03:58:41 AM Z
Cor Breukel wrote:
>
> On ISO rating for IR: there are almost as much different approaches as
> there are IR shooters.
>
> It all depends on the combination HIE/filter/developer.
>
> I am not surprised about this high ISO; the #87 film is (almost) opaque,
> and there is very very little light getting through it, which can be
> read by the in-camera meter, hence the hughe "correction" on the speed.
>
> For what it is worth: my procedure: rate at the camera meter at 250 ASA,
> with a 25 (dark red) filter mounted, bracket, and process in D76 1:1 for
> 11 minutes at 20dgC..
>
> Cor
>
> "David J. Romano" wrote:
> >
> > I haven't read Theresa Airey's book, but I rate my Kodak HIE very fast. I have a Canon A-1. I started using it because it has a non textured film pressure plate. My Pentax ME Super's pressure plate has little engraved diamonds which showed up on my film. (no anti halation backing) I determined the ASA of the film by placing a #87 filter over the lens and exposing an average scene at different ASA settings using the A-1's auto expose setting. The camera's ASA dial goes up to 12800. I process in HC-110. My ASA is about 11000.
> >
> > Before doing this I was using an infrared exposure meter. Its a little hand made one using parts you can get at Radio Shack. I built it in college from an article I found in a photo magazine. I needed it because I was shooting my thesis with infrared film. My professor said "you have to bracket alot beacaue you can't meter infrared light". That's ridiculous. At 9 dollars a roll I wasn't willing to spend all my beer money on school work. Incidentally, the ASA of 11000 on my Canon matches the reading on my homemade meter.
> >
> > Dave
> >
> > For those interested,
> >
> > PbS Photo conductive cell (a couple bucks)
> > batteries
> > voltmeter w/indicator needle (about 15 bucks)
> > on/off switch
> > project case
> > #87 gelatin filter
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