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  1. #11
    Photo Engineer's Avatar
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    Keith;

    Yeah, I goofed. Sorry. But all of the films have some degree of UV protection except the newest B&W that Kodak designed for alternative printing.

    Thanks. I read that one with my brain somewhere else.

    My bad.

    PE

  2. #12
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    Just as an addendum to the last post, Keith, a film's transmission spectrum before exposure is equal to its measured spectral sensitivity (absorption) after exposure. This should help when comparing with what I posted above.

    PE

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    Oh, I guess that does make sense. Thanks for putting those pieces together for me PE.

  4. #14
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    Quote Originally Posted by Photo Engineer View Post
    Just as an addendum to the last post, Keith, a film's transmission spectrum before exposure is equal to its measured spectral sensitivity (absorption) after exposure. This should help when comparing with what I posted above.

    PE
    What if you use a staining developer?
    "Only dead fish follow the stream"

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  5. #15
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    Then you add in the relevant stain. I left that out as I have seen stains that range from yellow through brownish to green. But you are right in that case.

    PE

  6. #16
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    Actually I was thinking more along the lines of Blue and Green transmission and MG printing. Kind of to confirm or refute the idea the a different film bases or stained negatives would need a different calibration tables for MG printing.

    I currently don't use staining developers because of real or imagined effects on MG printing. Would be interesting to see the magnitude of the mired shift of pyro negatives. Or, more practically, how many CCs of (yellow or whatever) the stain adds to the system.

  7. #17
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    There have been threads on MG printing of stained negatives IIRC. Since I don't use that method, I have pretty much ignored them. You see, the stain is a dye, and that dye like all dyes, will fade eventually. So a stained negative is a moving target over a certain period of time. IDK if anyone has measured it or quantized it.

    But, it is not one of my favorite fields.

    PE

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