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  1. #11
    Ian Grant's Avatar
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    Quote Originally Posted by Q.G. View Post
    In an image that consists of different amounts of light at different places?
    There are no lower or upper thersholds.
    The difference between 2 and 3 is the same as that between 6 and 7.
    The logic is that if you add 1 to 2 then that's a a 50% increase but add 1 to 3 is only a 33.3% increase, add 1 to 6 is only 16.7% etc. OK the effect isn't as large but it's the same logic

    Increasing development does the opposite because it boosts the areas that had more exposure by a greater extent.

    So the effects of flare are reduced localised contrasts.

    Ian

  2. #12

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    MC vs SC

    Cosina charges the same price for mc or sc lenses, they only have two focal lengths, best of my knowledge.

  3. #13

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    Quote Originally Posted by Ian Grant View Post
    The logic is that if you add 1 to 2 then that's a a 50% increase but add 1 to 3 is only a 33.3% increase, add 1 to 6 is only 16.7% etc. OK the effect isn't as large but it's the same logic

    Increasing development does the opposite because it boosts the areas that had more exposure by a greater extent.

    So the effects of flare are reduced localised contrasts.

    Ian
    I understand the logic.
    But that only works if you assume an absolute base. In an image produced by a lens, there is no such thing. Except when all you put in front of it is absolute darkness.
    So what you have is a difference between two, undeterminded, levels, and the difference between those same two levels after an equal amount has been added to everything.

    You are talking about the effect on film. That, however, depends on where you place that contrast, and on what shape of curve. That's an exposure and processing matter.

    The thing the film is presented with only differs (not much) in overall level. The same contrasts, the same transitions, big, small and micro.

  4. #14
    Ian Grant's Avatar
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    I'd buy the MC version, there's no downsides to multi coated lenses and there's no economic advantage.

    Ian

  5. #15

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    Quote Originally Posted by herb View Post
    Cosina charges the same price for mc or sc lenses, they only have two focal lengths, best of my knowledge.
    What lens is it exactly? For what camera?

    There are in fact several lines of "Voigtländer" lenses.

  6. #16
    Ian Grant's Avatar
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    The effects of internal flare on the film are in addition to the shape of the curve of a film developer combination and work the other way, flare has a greater effect on the shadows, development on the highlights.

    One can't compensate for the other something has to be lost.

    Ian



    Quote Originally Posted by Q.G. View Post
    I understand the logic.
    But that only works if you assume an absolute base. In an image produced by a lens, there is no such thing. Except when all you put in front of it is absolute darkness.
    So what you have is a difference between two, undeterminded, levels, and the difference between those same two levels after an equal amount has been added to everything.

    You are talking about the effect on film. That, however, depends on where you place that contrast, and on what shape of curve. That's an exposure and processing matter.

    The thing the film is presented with only differs (not much) in overall level. The same contrasts, the same transitions, big, small and micro.

  7. #17

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    The 35mm F1.4 Nokton and the 40mm F1.4 Nokton are both offered in mc or sc for the Voiglander Cosina Bessa cameras. Will fit any Leica mount camera.

    Ian is making my head hurt. He just about had me on a sc and then says he would get the mc. I am going to do black and white 90% of the time, so I think the sc may have some benefit. In a few years when I am 80 I may be a good enough photographer to know how to make this work.

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