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Thread: Infrared Exposure Meter?

  1. #11

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    Re: Infrared Exposure Meter?

    Quote Originally Posted by Old-N-Feeble View Post
    Basically, what you're conveying is, particularly with films like SFX200, I'm just as well off metering through my non-SBC through a #29 filter? There's not much I can do to more accurately meter the IR from foliage?
    Yep - there is not much to be done about SFX (and other similar speed trap films) that can't be done with a regular meter, they don't reach far enough into IR that you need to bother. And EFKE on the other hand has such a bizarre low-sensitivity IR response that a corresponding metering filter would be quite a expensive research subject. Hacked meters were more helpful in EIR/HIE days.

  2. #12

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    Re: Infrared Exposure Meter?

    I've converted several, all of the meter sensors are tremendously more sensitive to long wave lengths the the shorter ones. Virtually all meters have IR cutting filters built in. I would suggest that you use the meters I have used for this such as the Luna Pro, you can buy them used pretty inexpensively. Open the meter up, you'll find a small glass filter that has a greenish/blue cast. First clean it! Next get an 87 or 88 gel filter, cut it the same size as the glass filter and insert it, now close the case. Now you will know what the approximate exposure in a daylight situation, so set up the ASA/ISO so that the indicated exposure is the same as the expected exposure. Now it is just a matter of fine tuning the meter according to the IR exposure. This will work for daylight, flash (yes there is a great deal of IR in electronic flash), tungsten, or whatever. If you convert a DSLR to IR it will work for that as well.

    Lynn

  3. #13

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    Re: Infrared Exposure Meter?

    I suppose that works with a Luna Pro-F as well?

  4. #14

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    Re: Infrared Exposure Meter?

    I simply use my pentax digital spotmeter. I set the film speed to asa 12. If there is blue sky I meter that with my IR filter over the front of my light meter. That is usually my darkest shadow. I check other shadows just to make sure. I place my lowest reading right between zone 3 and 4 and fire away. Hasn't failed me yet.

    ETA: I am using Efke IR820 and a Hoya R72 filter.

  5. #15

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    Re: Infrared Exposure Meter?

    Quote Originally Posted by Old-N-Feeble View Post
    I suppose that works with a Luna Pro-F as well?
    That (or rather, its non-flash predecessor) is the converted one I still have around. Easy to do, just disassemble the case and replace the blue filter with the IR one you are after (I put a yellow filter in mine, for EIR, but that would be pointless now). Oh, and if you have the same meter with and without conversion, paint the converted one bright red (or do something else that makes it immediately identifiable) or you'll be in for some ugly surprise sooner or later...

  6. #16

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    Re: Infrared Exposure Meter?

    I want to try SFX200 for pictorial landscapes and want a subtle effect so I'll probably be using a #29 Wratten filter.

    Will the meter behave differently if I hold the filter in front of the meter rather than install a cut piece of filter at the sensor?

  7. #17
    Format Omnivore Brian C. Miller's Avatar
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    Re: Infrared Exposure Meter?

    Quote Originally Posted by Old-N-Feeble View Post
    ... because I want light but not white foliage and I don't want significant halation effects. I'm looking for subtle tonal enhancement rather than dramatic effects. ...
    If it isn't Kodak HIE/HIR, then it's always questionable about what you will get. Here's the reason: different plants reflect IR in different ways. The cell structure reliably reflects IR at the wavelengths that made HIE so great as an aerial surveillance film. But without that spectral sensitivity, you don't know what you'll get if it isn't deciduous foliage. Up where I live most of the trees are conifers. These reflect IR in different spectra, and not all reflect IR in the same spectral sensitivity as is needed for the film. Some are black, some are grey, some are white, and that's with a very dark B+W 092 filter. (B+W 091 = Wrattan 29)

    If you use a 25, then you may not get anything. If you use a 29, you might see a bit with deciduous foliage. One time I was out with Konica IR (similar to SFX 200 and Efke), in the deep shade under pines or similar. I thought that there wasn't hardly any IR around. Boy, was I absolutely wrong. The first exposure and +/- brackets were good, and the rest just turned the film oh-so-overexposed.

    With IR, you just take your chances.

    Oh, yeah, halation: you won't see it. Kodak film did not have an antihalation layer. The only film you'll get with this is the Adox (Efke) "Aura" IR film.
    "It's the way to educate your eyes. Stare. Pry, listen, eavesdrop. Die knowing something. You are not here long." - Walker Evans

  8. #18

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    Re: Infrared Exposure Meter?

    Does anyone make a narrow band IR pass filter... something like 600-700 nanometers? Or maybe I can combine a Wratten #70 filter with an IR cut-off filter at 700 nano or so? If so then maybe I could take separate spot readings of visible and IR light so I can combine the two for more predictable results with SFX.

  9. #19

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    Re: Infrared Exposure Meter?

    Quote Originally Posted by Old-N-Feeble View Post
    Does anyone make a narrow band IR pass filter...
    Edmunds, Surplus Shack and the like might have suitable dichroic bandpass glass filters. But be warned, these are quite hard to cut down.

    And as I said, you need not worry that much about exposure as long as you stick to SFX. The IR band provided by SFX can be treated as a simple matter of object colour (which you generally don't explicitly adjust your exposure for when using panchromatic film) - in that near-visible range the IR intensity of daylight and incandescent lighting will be in a fairly constant proportion to the visible band.

  10. #20
    tgtaylor's Avatar
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    Re: Infrared Exposure Meter?

    Believe it or not but my Pentax 67II meters Rollie 400 IR film with Cokin 007 IR filter attached perfectly.

    Thomas

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