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Thread: Slide film metering

  1. #11

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    Re: Slide film metering

    Quote Originally Posted by Pere Casals View Post
    My view is that (with slides) indirect metering is very consitent in some particular conditions, like flowers in the shadow, but it is not as good under challenging conditions, for example if we have a landscape with sun relatively low we will need to know if clouds and sky are to be overexposed and by what amount, and what graded ND filter we have to add to preserve color and detail in the sky, in those conditions spot metering is important.
    This is exactly what I was dealing with this weekend and which prompted my question. I had some pink clouds that I wanted to retain and a dark foreground. Averaging, both were close to outside the 2.5 stops. So I thought I could bump up the shadows by shutter but compensate for that with the ND.

  2. #12

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    Re: Slide film metering

    Quote Originally Posted by biedron View Post
    You've got it right if, when you say "darken the highlights with my ND grad .3EV + the .3EV from the shadow exposure compensation", you mean that you will use a ND grad to darken the highlights by .6EV. Your phrasing was slightly ambiguous, at least to me. After you lighten the shadows by .3EV, the highlights, previously at +2.3EV, are now at +2.6EV, so they must be brought down .6EV with the ND grad to fit in the +2/-2 range.

    Of course that is assuming you want to fit everything in the +2/-2 range. Depending what you seek to achieve in the image, you could leave the shadows where they are and just bring down the highlights. That would leave some shadow area blocked, but maybe that would work - depends on the image. The opposite, retaining the shadows and blowing (significant) highlights, usually doesn't work in my opinion.
    Thanks, this is what I thought might work.

  3. #13

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    Re: Slide film metering

    Quote Originally Posted by nbagno View Post
    This is exactly what I was dealing with this weekend and which prompted my question. I had some pink clouds that I wanted to retain and a dark foreground. Averaging, both were close to outside the 2.5 stops. So I thought I could bump up the shadows by shutter but compensate for that with the ND.
    This is, you should know how every kind of suject looks at +3, +2, +1, 0 , -1 , -2 , -3. How clouds, water or grass looks at what exposure shift, then you decide.

    Think that exposure meters are more or less sensitive to green or to blue (for example) because particular spectral sensitivity. For example Blue may read lower than Green and sky it may look less overexposed than it will be.

    Because that, testing with real subjects and anotating well the conditions of the bracketing is what will give you a precise criterion to control the result. Slides are amazing, IMHO the most amazing result one can obtain with a camera today, top notch, but a mistake with LF slides is painful, very painful. So checking shutters and accurate metering is a key factor.

  4. #14
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: Slide film metering

    Quote Originally Posted by nbagno View Post
    This is exactly what I was dealing with this weekend and which prompted my question. I had some pink clouds that I wanted to retain and a dark foreground. Averaging, both were close to outside the 2.5 stops. So I thought I could bump up the shadows by shutter but compensate for that with the ND.
    The ND filter will darken everything in view, including the shadows.

    You control shadow detail with exposure.
    You have to have enough photons hitting the film to form a latent image.

    You control highlight detail with development.
    Development only changes highlights (dense areas in the negative).

    That technique is only 100+ years old.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

  5. #15

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    Re: Slide film metering

    Quote Originally Posted by Leigh View Post
    The ND filter will darken everything in view, including the shadows.
    True for plain NDs, but the OP was referring to graduated NDs

  6. #16

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    Re: Slide film metering

    Quote Originally Posted by Leigh View Post
    The ND filter will darken everything in view, including the shadows.

    You control shadow detail with exposure.
    You have to have enough photons hitting the film to form a latent image.

    You control highlight detail with development.
    Development only changes highlights (dense areas in the negative).

    That technique is only 100+ years old.

    - Leigh
    He's talking about using a graduated ND filter.

    Of course that assumes the highlights are all in one place and the shadows are all in another. Pretty good chance of that in a landscape, but limited usefulness in other compositions.

  7. #17

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    Re: Slide film metering

    Quote Originally Posted by Leigh View Post
    The ND filter will darken everything in view, including the shadows.

    You control shadow detail with exposure.
    You have to have enough photons hitting the film to form a latent image.

    You control highlight detail with development.
    Development only changes highlights (dense areas in the negative).

    That technique is only 100+ years old.

    - Leigh
    NDGrad, not ND. I mention controlling shadow detail with exposure.

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