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  1. #11
    AgX
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    Maybe a missing coating. Maybe elements with neutralizing colour hue, as I refered to above.
    We got some old-lens experts here. They would know better.


    A reduction in transmission from 85% to 65% as in your Ektar chart would be 1/2 stop.

  2. #12
    RalphLambrecht's Avatar
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    Quote Originally Posted by AgX View Post
    I don't expect the transmission of lenses above the UV region to vary substantially.
    that makes sensebecause,at that point you are basically looking at the spectral transmission data of optical glass.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  3. #13
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    I don't see how yhis relates to the question or the statement
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  4. #14
    AgX
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    The transmission of lenses is the topic of this thread.
    And this is dependant on the characteristic of the medium (typically optical glasses), but also on a anti-reflection coating employed.

  5. #15
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    I agree and even a plain glass filter absorbs most UVanyway.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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