Ball park exposure for HIE + 87 filter...

Man, I have just spent nearly an hour in trying to get something conclusive about this combo.

In short, I am shooting some HIE tomorrow morning and usually use an 89B filter. But, I have a 87 and would like to give it a try. It will be in very strong sunlight, so what would be a starting point for exposure?

Wow, no one know this info? Better email Geir Jordahl....

My experience with this combination is to start at f22 exposing for 30 seconds in bright sunshine. I usually expose a second sheet for 1 minute, generally speaking one of the sheets will give me a printable negative. On suspect or very important subjects in my mind, I will sometimes add another neg for 2 minutes. I develop mine in 1:75 rodinal for 8 minutes in a jobo drum set up. To me there is no exact science to exposing or developing this time. I just noticed your reference to "HIE", I have not had that film available for a number of years, what I have described above is accomplished with "efke IR Aura".

Jim

jimt9839 said:

I just noticed your reference to "HIE", I have not had that film available for a number of years, what I have described above is accomplished with "efke IR Aura".

Jim

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HIE will require much less exposure than any currently-made IR film, especially with the 87 filter.

The 87 filter hits 50 percent transmission at 800 nM, and it requires about two stops more exposure than an 89B/R72.

2F/2F said:

HIE will require much less exposure than any currently-made IR film, especially with the 87 filter.

The 87 filter hits 50 percent transmission at 800 nM, and it requires about two stops more exposure than an 89B/R72.

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Thanks, this is what I thought too, I am going to just run a snip on 35mm before I start gnawing away at the 120 stuff....

I would guess you'll need ~6 stops of compensation. But it depends a lot on atmospherics, and I'd bracket in 3 stop intervals. Also, because of the tendency for dated HIE to show pinhole-like defects, I'd also shoot doubles if the shot is important. Not what you want to hear, since this is precious film, but... there aren't too many otpions.

If it were I, I'd shoot in broad daylight with a deep red filter and give it ~2 stops of exposure compensation.

keithwms said:

I would guess you'll need ~6 stops of compensation. But it depends a lot on atmospherics, and I'd bracket in 3 stop intervals. Also, because of the tendency for dated HIE to show pinhole-like defects, I'd also shoot doubles if the shot is important. Not what you want to hear, since this is precious film, but... there aren't too many otpions.

If it were I, I'd shoot in broad daylight with a deep red filter and give it ~2 stops of exposure compensation.

Click to expand...

It's basically fresh HIE that looks fantastic, bought 100 rolls of the last batch then stuck in a freezer at -20F.

Set your camera meter to 1000 and meter thru the lens and filter at a subject that should be middle grey. Meters are oversensitive to IR so this works. Type of filter did not matter as the meter compensated. I used a 092 B+W

Around 1/250 @ 6.3 on a sunny mid summer day. I never used to bracket either.
Cloudy day, open one stop.

8.5 min in D76 for a condenser enlarger.

Focus for simple lenses, not zooms, is 5.6 on the close side of debth of field scale.
Find the focus distance, say infinity, then refocus to place infinity at 5.6. No need to focus bracket or use F22 either. Test you equipment to find variations.