Sunny 16 for IR?

[Mark_S]

I am dabbling with IR photography, using a 720nm filter. From the first few rolls that I have done, I am begining to believe that there is no way to meter a scene to end up with a decent exposure. This got me thinking - is there an equivalent rule like the 'sunny 16' rule for IR films?
From what I have seen, the speeds listed on the box are wildly optimistic.

[Terence]

Which film are you planning to use. They have vastly different qualities.

[Sirius Glass]

The problem is that the spectrum response of the light meter is no where close to the spectrum response of the IR film. Perhaps others here may know of a better way of setting the exposure for IR film, but I for one have never found a consistant method. That would leave trial and error.

Steve

[DrPablo]

If you're using a 720 nm filter with the Rollei IR film, you can start by exposing at ISO 3. That's worked pretty consistently for me.

[Terence]

Originally Posted by Stever

The problem is that the spectrum response of the light meter is no where close to the spectrum response of the IR film. Perhaps others here may know of a better way of setting the exposure for IR film, but I for one have never found a consistant method. That would leave trial and error.

Steve

I agree with you, and definitely bracket more for IR, but I can normally come up with a starting guess for a given lighting condition, ie. sunset at sea level versus mid-day at 10,000 feet. As the film becomes more IR sensitive, and as you use higher cutoff filters, the guesses become less accurate and require more bracketing. For instance, using Ilford SFX at mid-day at sea level with a #25 filter, I'll rate the film at about 100 and then adjust for the filter factor. Kodak EIR at sunrise atop Mt Rainier with an 89b filter is anybody's guess . . .

[pentaxuser]

Can I recommend "Infra- Red Photography - A complete workshop guide" by Hugh Milsom. This book does literally what it says on the tin as the advert runs. He covers several IR films quite extensively and thoroughly.

In the U.S. "Advanced Infrared Photography Handbook" by Laurie White-Hayball may be easier to get but in terms of helpfulness I think H Milsom's book has the definite edge.

pentaxuser

[nicolai]

Here are instructions for building your own IR meter.

[ben-s]

FWIW, I usually TTL meter through the filter (a Hoya R72). I've had success with MACO, HIE and EIR.

I have also tried metering through the filter, using an external meter (Sekonic L308B and Gossen luna-pro) This works too.

Bracketing is a must.

I've attached a quick illustration of what different filters do to IR film - primarialy to demo the wood effect, but interesting nonetheless. I adjusted the exposure to whatever the TTL meter read for each filter
The order is no filter, Yellow, Orange, Red, R72

[Dave Miller]

Originally Posted by ben-s

FWIW, I usually TTL meter through the filter (a Hoya R72). I've had success with MACO, HIE and EIR.

I have also tried metering through the filter, using an external meter (Sekonic L308B and Gossen luna-pro) This works too.

Bracketing is a must.

I've attached a quick illustration of what different filters do to IR film - primarily to demo the wood effect, but interesting nonetheless. I adjusted the exposure to whatever the TTL meter read for each filter
The order is no filter, Yellow, Orange, Red, R72

That's an excellent comparison Ben, but what film is featured?

[Sparky]

No. 87, f/4 and be there.