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Thread: Wet plate collodion spectral sensitivity?

  1. #1

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    Wet plate collodion spectral sensitivity?

    Can anyone tell me what the spectral sensitivity would have been like back in the 1850/60s. Was collodion simply just blue sensitive. I ask because I have a friend doing some lens software modelling for me on some of the early lens designs and he has asked what wavelengths would have been most important?

  2. #2

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    Re: Wet plate collodion spectral sensitivity?

    Have you looked for real research on it? Google it.

    I'm sorry, but such a technical question is like standing on the steps of a major electronics research library, and asking people going inside "can you tell me the resonance frequencies of a capacitive reactance circuit?"

  3. #3

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    Re: Wet plate collodion spectral sensitivity?

    I'd have thought it basic data myself (but then I have a photo science background) and having searched I've found some data, but I'm a bit dubious about some of its assumptions. I thought that someone here might have had some data too.

  4. #4

    Re: Wet plate collodion spectral sensitivity?

    Quote Originally Posted by pgk View Post
    Can anyone tell me what the spectral sensitivity would have been like back in the 1850/60s. Was collodion simply just blue sensitive. I ask because I have a friend doing some lens software modelling for me on some of the early lens designs and he has asked what wavelengths would have been most important?
    This should answer your questions: https://www.lundphotographics.com/in...dion_film.html

  5. #5

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    Re: Wet plate collodion spectral sensitivity?

    Thanks, it does and I've sent on the link.

  6. #6
    Tin Can's Avatar
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    Re: Wet plate collodion spectral sensitivity?

    Lund is stepping up

    That is new news!

    Quote Originally Posted by paulbarden View Post
    sin eater

  7. #7

    Re: Wet plate collodion spectral sensitivity?

    Quote Originally Posted by Tin Can View Post
    Lund is stepping up

    That is new news!
    "Stepping up"??

  8. #8
    Tin Can's Avatar
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    Re: Wet plate collodion spectral sensitivity?

    Meaning they are still posting useful data

    Dated May 19, 2020 by Lund


    Quote Originally Posted by paulbarden View Post
    "Stepping up"??
    Last edited by Tin Can; 2-Jul-2020 at 08:08. Reason: add May 19, 2020
    sin eater

  9. #9

    Re: Wet plate collodion spectral sensitivity?

    Quote Originally Posted by Tin Can View Post
    Meaning they are still posting useful data

    Dated May 19, 2020 by Lund
    Yes, they do so intermittently.

  10. #10
    Drew Bedo's Avatar
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    Re: Wet plate collodion spectral sensitivity?

    I thought that wet-plate era emulsions pretty much ortho; were sensitive to the blue-green end of the spectrum. Not sensitive to the red end or into the Ultra-Violet.

    One could do some experimentation with B^W colored filters. A sort of contact printing set up could expose one plate to several colors from Red Green, Yellow and Blue. I am sure thart someone here can figure ourt a more sophisticated and more effective way way to do this in one shot.
    Drew Bedo
    www.quietlightphoto.com
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

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