Infrared Film Sensitivity

Discussion in 'Black and White' started by curtis_lowe, Aug 9, 2008.

  1. I have been doing some reading and understand the following:

    Uultraviolet radiation ranges from 1nm to 400nm
    Visible light ranges from 400nm to 750nm.
    Infrared light ranges from 750nm to 1mm.

    These may be rough estimates but as some of the films on the market today are regarded as “near infrared” or
    described as having extended red sensitivity, I wish to know what range does “near Infrared” fall?

    Thanks,
    Curtis
     
  2. Here is a pdf on Ilfords SFX film:

    http://www.cocam.co.uk/CoCamWS/Infrared/IRfilmdata/sfx200.pdf

    Please examine the graph and notice how the SFX emulsion extends the sensitivity.

    Hope this helps you!
     
  3. NIR starts where a panchromatic film normally ends, 650-670nm and for NIR films they're going to 740-750nm.
    The Efke IR820 and Rollei IR 820/400 a bit more: Till 820nm but not so far as the HIE (Kodak) which was going over 900nm but this film is recently discontinued.
    HIE was a real high sensitive IR film.
     
  4. Thank you both.

    So if NIR film ends around 740-750nm, can we see NIR as I read that visible light is from 400nm to 750nm?
     
  5. Here is an interesting article about IR photography including all wave lenghts;

    http://www.vividlight.com/Articles/2915.htm
     
  6. Extended red panchromatic films are: Rollei ATP-1.1 Tech Pan and the Rollei R3.
    NIR films: SFX (Ilford) and Rollei SUPER PAN 200 (max. 750nm)
    Extended NIR films: Efke IR 820 (iso 100), Rollei IR820/400 (iso 400)

    All mentioned films are regular production films, however the SUPER PAN 200 is a new prototype film available up from the Photokina 2008 in Cologne also available in 120 roll film.
     

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