How do you expose a high-contrast scene with deep blacks, bright whites, and a midtone subject?
Asked 1/8/2021
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I’m learning handheld spot metering and want to understand how to expose a scene that contains very dark shadows, very bright highlights, and a midtone subject.
For example, suppose spot-meter readings at the same shutter speed are:
- deep shadow: 1/125 at f/1.4
- bright highlight: 1/125 at f/8
- midtone subject: 1/125 at f/4
How should these readings be used to choose exposure? Do you combine them mathematically, or is the right approach to decide which tones are most important and place them within the medium’s dynamic range? If the scene contrast is too wide, is it simply impossible to hold detail everywhere?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
5y ago
2 Answers
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The problem: (This is likely both over simplified, and wrong in detail. The last time I read about the zone system was 30 some years ago.)
Ansel regarded film as portraying 11 signficiantly different levels of grey.
Black and white film of the Pan-X (ISO 100) could handle about 10 stops. Tri-X was higher contrast and cold do something like 7-8 stops.
Satin finish paper has about a 100:1 contrast ratio. Or about 8 stops.
Modern digital cameras handle about 12-13 stops.
With film you don't have the ability the same way you do digitally to adjust the contrast curve easily. Instead there were a whole bunch of recipes for adjusting the exposure and development conditions. (Hence , "expose for the shadows, develop for the highlights." And there were variations that increased mid tone contrast but left highlights/shadows more or less the same.
What are we to do?
In the digital world we have it easy. Sort of.
Situation 1: Your scene has less than 8 stops luminance. Take the picture. Adjust mid tones. Print it.
Situation 2: Your scene has more than 8, but less than 12 stops difference in luminance. Take the picture. Adjust the range of luminance to match your output medium. Adjust the mid tines. Print it.
Situation 3: Your scene has more than 12 stops difference in luminance. Shoot a series of HDR pictures, map the range of exposures to your output medium...
Originally by user17873. Source · Licensed CC BY-SA 4.0
user17873
5y ago
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You generally do not average spot readings or take a square root. Spot metering is used to measure important tones, compare their brightness range, and then decide where to place them within the recording range of your film or sensor.
In your example, shadow to highlight is about 5 stops (f/1.4 to f/8), with the midtone at f/4. If your camera/film can hold that range, a midtone exposure around 1/125 at f/4 is reasonable.
The Zone System idea is: meter the tones you care about most, then place them intentionally. If preserving shadow detail is critical, expose more toward the shadows; if highlight detail matters more, protect highlights. For negative film, the classic guidance is “expose for the shadows, develop for the highlights.” With digital, highlight clipping is often the main limit, while shadows can often be lifted later.
If the scene exceeds the medium’s dynamic range, you cannot retain full detail everywhere in one exposure. Then you must choose what to sacrifice, or use techniques like changing development/processing, lighting, filtration, or multiple exposures/blending.
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