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  1. #1
    RenA's Avatar
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    What do you get when Developing Infrared Unexposed film

    Hello all,

    I have a question: what do you get if you develop unexposed infrared film? I have read that I can use this developed film as a infrared filter. But when I talked to a guy in one of the online shops, he wasn't 100% sure but said that I will get clear film. He recommended this forum to get definitive answer. I don't normally shoot film, but need IR filter, that will fit into a thin slot at the end of a fisheye lens. Standard poly filters are too thick for this job and I just can't find a foil that could be cut to size and serve as an IR filter.

    Thank you very much in advance.

    Ren

  2. #2
    holmburgers's Avatar
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    No, you're somewhat confusing two ideas.

    What people do is use unexposed and developed slide film, E6, which as you can imagine would be totally "black". Any film developed as a negative is going to be clear if it's unexposed.

    The silver in b&w film would probably impede IR energy too, making for a poor filter; dyes in general (and in E6 particularly) are notably "open ended" in their IR+ transmission, partly to curtail overheating in projection.
    If you are the big tree, we are the small axe

  3. #3
    Bill Burk's Avatar
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    Yes, a fully black E6 slide could be used as an infrared filter because infrared goes right through it.

    But it would not be good to slide inside a fisheye lens because it would not give you very good image quality.

    However you could use a slide over an electronic flash and discreetly shoot at night with it.

  4. #4
    RenA's Avatar
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    Thank you very much to both of you for such a great and fast answers.

  5. #5
    cliveh's Avatar
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    Quote Originally Posted by Bill Burk View Post
    Yes, a fully black E6 slide could be used as an infrared filter because infrared goes right through it.

    But it would not be good to slide inside a fisheye lens because it would not give you very good image quality.

    However you could use a slide over an electronic flash and discreetly shoot at night with it.
    Bill, I have never tried this, but it seems that it could have some interesting possibilities. I enjoyed seeing Weegee's infrared pictures taken with infrared flash, but is there enough infrared emitted by say a compact flash camera, with the flash covered by an non-exposed E6 slide to work in this way?

    “The contemplation of things as they are, without error or confusion, without substitution or imposture, is in itself a nobler thing than a whole harvest of invention”

    Francis Bacon

  6. #6
    Bill Burk's Avatar
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    I think an E6 over an electronic flash would be as effective as a Wratten 87 filter.

    I just held a couple slides over the Vivitar 283, in the darkroom and looked at it through the ATN Viper IR monacle.

    Get nice bright pops from the flash.

  7. #7

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    Would anyone here have any unexposed, developed slide film they could mail me? I'll gladly send you a couple stamps, maybe a little Bitcoin, or a PayPal dollar? I'm looking to retire my floppy disks for good.
    Thanks very much!!

  8. #8

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    Quote Originally Posted by eatkabab View Post
    Would anyone here have any unexposed, developed slide film they could mail me? I'll gladly send you a couple stamps, maybe a little Bitcoin, or a PayPal dollar? I'm looking to retire my floppy disks for good.
    Thanks very much!!
    How large a piece of film did you need? Actually, I am not sure if I have any at the moment, but if per chance you were wanting to make a Series-VI size filter, I would be happy to send you one of the ones I made:
    Click image for larger version. 

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    I can show a comparison between images made with the homemade E6 filter and an "official" IR filter too if anyone is interested.

  9. #9

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    I didn't use slide film, but I did once make an infrared flash filter by combining cinema gels; looking at the transmission curves suggested that it should have been similar to a Wratten 87. It worked, as far as I could tell, but unfortunately Rollei's IR film is so slow at those wavelengths that it was pretty impractical. If we still had HIE I bet it would have worked a treat.

    -NT
    Nathan Tenny
    San Diego, CA, USA

    The lady of the house has to be a pretty swell sort of person to put up with the annoyance of a photographer.
    -The Little Technical Library, _Developing, Printing, And Enlarging_

  10. #10
    winger's Avatar
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    Years ago, I got a filter sample pack from Roscolux. The samples are just an inch or so by 3 inches, but that's enough to cut a piece to fit in the back of a fisheye. I originally got the pack to make some orange filters for a microscopy thing at the lab (needed to filter close to a sodium D line to look at the refractive index of glass shards). I don't have the rest of the pack here to see which one I used for the fisheye, but there was one that worked (a dark red). My camera was still able to autofocus and meter through it and I know I have some decent HIE shots using the combo. I don't know if this is quite what you need or not, but it worked for me.



 

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