Pre-exposing 4x5 transparency film

Discussion in 'Color: Film, Paper, and Chemistry' started by jwrupnorth, Sep 22, 2002.

  1. jwrupnorth

    jwrupnorth Member

    Sep 9, 2002
    Southern Cal
    In Ansel Adams book 'The Negative', he goes into a bit if detail regarding the advantages of pre-exposing both black and white and transparency film, primarily where increased shadow detail is neccessary.
    He mentions the possible use of a color compensating filter sandwiched between two opaque sheets of plastic when pre-exposing color transparency film. The object would be two-fold: Open up the shadows a touch, and reduce the bluish cast of shadows caused by illumination from the sky.
    What # color compensating filter(s) are we going to use for this, and can anyone be specific about the type, thickness, and opacity of the plexiglass he mentions?
  2. b.e.wilson

    b.e.wilson Member

    Sep 7, 2002
    Provo, Utah
    4x5 Format
    I guess no one does this. I think I did once. While loading some exposed film onto the developing tank reels, the red heater lamp on my Jobo came on, and I realized then that I'd forgotten to cover it. I had some shots on that reel that should have had some deep blue shadows (Velvia in shade), but the shots came out rather nicely. I never went back to test my impromptu heater-lamp-post-exposure-burner, but I haven't been worrying about covering that lamp anymore.