Efke IR820 ISO

Boris Mirkov · Apr 10, 2010

Tomorrow I`m going to shoot infrared but I have no idea which ISO setting to put on my Nikon F100. Somewere I find 6 ISO, somewere 200 ISO so I`m pretty confused. If someone has some expirience with this film, please help! I`m using Cokin 89b which is like Hoya R72.
Thanks for the help!

Boris Mirkov · Apr 10, 2010

And one additional question - I`ve heard I could get infrared results using ordinary film with infra filter. Could that be true?

RobertV · Apr 10, 2010

Hi Boris,

Efke IR820C is based on the Efke 100 film with extended sensitizers to 820nm.
Using a 89B - 695nm (0007) (5-6 F stops) will give you iso 1,5 - 3 only.

When using a standard panchromatic B&W film (normally till 650nm) you will filter every thing away for the film, so blanc negatives.
IR film you CAN use without filter. It's then a standard film again.

You have to bracket a bit because you never know exactly the amount of IR light in the atmosphere.

Best regards,

Robert

nickandre · Apr 10, 2010

Use ISO 3 with that film if you're using a 720 cutoff. You might go lower than that, but you run into issues with depth of field/reciprocity. Without a filter it's a 100-200 speed panchromatic film.

ntenny · Apr 10, 2010

The ratio of IR to visible light varies a *lot* with time of day, weather, latitude, and who knows what else, which makes it pretty much impossible to assign a meaningful EI to this film in general. I've gotten good results at EI 6 on some days, and terrible underexposure at EI 1.5 on others. Bracketing and experimenting to find what works for the conditions you typically shoot is probably the only real way to go.

I've actually had some luck metering *through* the filter, with the meter set to 100. The results were a bit thin and I'd probably add a stop or two if I did it that way again. I have no idea how reliable this method really is, though---I guess it depends on the sensitivity of your particular meter to IR.

-NT

Boris Mirkov · Apr 10, 2010

Тhanks to all for the help, I`ll do my best and develop it in the next few days so hopefully we`ll see the results soon.
Thanks again!

RobertV · Apr 11, 2010

Important is to make one picture without filter so that later you can check if at least your development is OK.

ath · Apr 11, 2010

lots of data and pictures to compare here: http://www.digitaltruth.com/articles.php in the infrared section.

Boris Mirkov · Apr 11, 2010

I just came back from the shoot and at the thirtieth shot i realized that I haven`t been covering the viewfinder! So my measurements are not what they were supposed to be... I`m gonna develop it tonight and send the results...
Thanks everybody once again for all the help!

wildbill · Apr 11, 2010

2 seconds@16 and you'll be in the ball park on a sunny day. metering through the filter doesn't work for me.

kraker · Apr 12, 2010

Boris Mirkov said:
And one additional question - I`ve heard I could get infrared results using ordinary film with infra filter. Could that be true?

Probably not with any ordinary film, but there's an example of Delta 3200 (there was a url link here which no longer exists). Remember, you saw it on APUG first!

Toffle · Apr 12, 2010

kraker said:
Probably not with any ordinary film, but there's an example of Delta 3200 (there was a url link here which no longer exists). Remember, you saw it on APUG first!

That is pretty cool. I remember trying a couple of films with an R72 before giving up. The look is pretty good. I will try that some time. (I'll probably stick to EFKE, though... LOVE that look)

ntenny · Apr 12, 2010

RobertV said:
Important is to make one picture without filter so that later you can check if at least your development is OK.

The edge markings should tell you that, n'est-ce-pas? That's what I've always relied on.

How cool is that about Delta 3200? I had no idea.

-NT

RobertV · Apr 13, 2010

The edge markings should tell you that, n'est-ce-pas? That's what I've always relied on.

Je ne dis rien mais c'est ne pas la verité.
On markings only you can only get a conclusion the developer worked so far......

Maybe you have to read this book:
http://www.fotohuisrovo.nl/documentatie/Schroeders_N_P_Infrarot.pdf

Regards,

Robert

Efke IR820 ISO

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