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When the Zone System photographer spot measured the shadow detail she wanted to render with detail and set the exposure and then spot metered the highlights and discovered they would blow out with normal development what did she do?
Joe
Decide which will not have detail.... shadows or highlights. Film or digital, take your pick.
Nope. She used her N- or N-- film back to make the exposure. Later in the darkroom that film got modified processing that would allow her to retain the shadow detail placement while reposition the highlight placement on the film within a manageable printing range. Altering the development time brought into play the unique characteristic of film such that the shadow detail placement is basically unaffected while the highlight placement is pulled down -- highlight and shadow detail are disproportionately effected by changes in development time. But you're right about digital, it can't do that.
Joe
You certainly CAN do it with digital. You use a sensor that is capable of capturing the dynamic range of the scene.
Just like you change film (yes, different films have different dynamic ranges) and development, one can learn about the dynamic range of sensors. If a D40 is up to the task, you can use a D40. If you need a D850, then you use a D850.
N+1 and N-1, etc, are the same as using Exposure Compensation.
Using a digital camera with DR capable of capturing the scene is not the Zone System. If you have that then you don't need the Zone System. The whole point of the Zone System was to be able to manipulate film via processing to adapt to the lighting contrast variances that occur in uncontrollable ambient light conditions.
Dividing up the tonal range into 1 stop "zones" taking spot measurements and doing a little counting is not the Zone System -- that's just a piece of the process that's necessary to calculate the required film processing adjustments. You can't cut off the critical piece that makes it go and say you still have it.
N+ and N- are not at all the same as exposure compensation. They are applied to film during development after exposure and do not alter exposure. Exposure compensation alters exposure. The effect that N+ or N- has on film is disproportional shadows/highlights. The effect of exposure compensation is proportional shadows/highlights.
Measure the shadow in which you wish to retain detail and set that exposure. Measure the highlight. If your highlight measurement indicates that the highlight will exceed the sensor DR and clip, let's say by 1 stop, then as you noted you are screwed -- as you said; decide which one you won't get. Digital sensor DR is fixed and can not be expanded via any kind of manipulation.
In that same scenario using film, N- development (not changing film) (and not an EC change in exposure) will allow you to retain the exposure and shadow detail while pulling the highlight through development down into a successfully printable range. With the digital camera you remain screwed.
Joe
So how does the Zone System magically work when your film, exposure and development.... at best........ can record, say 9 stops of dynamic range and the scene contains 11 stops?
There are limits to both digital and film in terms of recording dynamic range. Pre-flashing, using N+a billion or N-a trillion plus stand developing isn't going to be a magic bullet. Eventually, the limit of the technology will be reached.
DR in film is fixed, just like digital.