Dynamic Range
Written by Abin Alex and Anu Joseph.
Abstract
Dynamic range is the span of brightness a camera can hold, counted in stops. This guide relates it to the brightness range of the scene and to contrast, and presents the Zone System that Ansel Adams and Fred Archer built to decide where each tone should fall. It examines the use of the Zone System with a digital camera, the advantage of RAW files, HDR, and the characteristic curve that describes how film and sensors respond to light. It also states how much dynamic range each kind of photography needs. It is written for photographers and cinematographers.
Keywords: dynamic range; Zone System; contrast; HDR; RAW
What is dynamic range?
Short answer. Dynamic range is the distance from the brightest tone to the darkest, counted in stops. Each stop doubles the light, so 10 stops means a ratio of 1,024 to 1. A scene has a dynamic range, and so do a camera and a print. Detail is lost wherever the scene is wider than the camera can hold.
- It is also given as the ratio between full well capacity and the noise level.
- ARRI measures it as the ratio between the saturation signal and the lowest signal where the signal to noise ratio is 1 (ARRI, 2022).
- ARRI quotes 17 stops for the ALEXA 35 and 14.5 stops for the ALEXA Mini LF (ARRI, 2022). Older books gave about five stops for a digital chip. Modern cameras are far wider.
- If the scene is wider than the camera, expose for what matters, or bracket the exposure and combine the pictures into one HDR image, as the chapter on HDR explains.
Cham tipThink of dynamic range in stops. “Ten stops” says more than “a lot of range”.
Cham taskFind the dynamic range figure in your camera’s data sheet. Work out the ratio: two to the power of the number of stops.
Check yourself: A camera has 12 stops of dynamic range. What is the ratio of the brightest to the darkest tone it can hold?
4,096 to 1, because two to the power of 12 is 4,096.
What is subject brightness range?
Short answer. Subject brightness range, or SBR, is the full span from the brightest to the darkest part of what you are photographing, counted in stops. It joins the contrast of the subject itself with the contrast of the light falling on it.
- The rule is: subject brightness range equals subject contrast times lighting ratio (Präkel, 2009).
- A subject with a contrast of 32 to 1 (five stops), lit with a ratio of 2 to 1 (one stop), has an SBR of 64 to 1. That is six stops.
- Ratios multiply, so stops add. Five stops plus one stop is six stops.
- To measure it, spot meter the brightest area and note the reading. Then meter the darkest area, changing only the aperture or only the shutter speed, and count the stops between the two.
- If the SBR is wider than the dynamic range of your camera, you must choose which end to protect, change the light, or merge several exposures.
- In a studio you can lower the SBR by moving a lamp or adding fill light. Outdoors you can wait for the light to change.
| Part | Ratio | Stops |
|---|---|---|
| Subject contrast | 32 to 1 | 5 |
| Lighting ratio | 2 to 1 | 1 |
| Subject brightness range | 64 to 1 | 6 |
Table 1. A worked example of subject brightness range. The ratios multiply, so the stops add.
| Reading | Setting | Stops |
|---|---|---|
| Brightest area | f/11 at 1/250 s | Start |
| Darkest area, aperture opened until the meter centres | f/2.8 at 1/250 s | 4 stops from f/11 |
| Subject brightness range | 4 stops, or 16 to 1 |
Table 2. Measuring subject brightness range with a spot meter. Opening from f/11 to f/2.8 passes f/8, f/5.6 and f/4.
Cham tipChange only one control, the aperture or the shutter, between the two readings. Then the stops you count are clean.
Cham taskChoose a scene. Spot meter the brightest and darkest areas, and write down the stops between them. Then see whether the histogram shows the same spread.
Check yourself: A scene has a subject contrast of 16 to 1 and is lit with a 4 to 1 lighting ratio. What is the subject brightness range?
64 to 1. That is four stops plus two stops, which makes six stops.
What is contrast?
Short answer. Contrast describes how far apart the tones in a picture are. With low contrast the tones lie close together and the picture looks flat. With high contrast the picture is mostly black and white with few greys. Colour contrast is a separate idea, such as blue set against yellow.
- Tonal contrast is the variation from white through grey to black. Colour contrast is the difference between colours.
- A high contrast picture is mostly white and black tones, with little or no middle grey.
- A low contrast picture has no strong highlights or shadows, and all tones are close.
- On a histogram a narrow hill is low contrast and a wide spread is high contrast.
- In lighting, contrast is set by the ratio between the lit side and the shadow side.
| Lighting ratio | Difference in stops |
|---|---|
| 2 : 1 | 1 stop |
| 4 : 1 | 2 stops |
| 8 : 1 | 3 stops |
Table 3. Lighting ratio and stops. Every doubling of the ratio is one stop.
Cham tipContrast is the distance between tones, not how bright the picture is.
Cham taskPhotograph the same face in hard sun and in open shade. Compare the two histograms.
Check yourself: A histogram is a narrow hill in the middle. Is the contrast high or low?
Low. All the tones are close together, so the picture looks flat.
What is the Zone System?
Short answer. The Zone System sorts the tones from black to white into eleven zones, numbered 0 to X, each one stop from the next. Zone V is middle grey, the tone a meter aims for. The system lets you decide before you shoot which zone each part of the scene should land on.
- Ansel Adams and Fred Archer developed it at the Art Center School in Los Angeles. Adams describes it in The Negative (Ansel Adams, 1981; Photo Review, n.d.).
- There are eleven zones, written with Roman numerals from 0 (pure black) to X (pure white).
- Zone V is middle grey, about 18 percent. One zone is one stop.
- Most useful tones fall in Zones III to VII, but texture can show from Zone II to Zone VIII (Photo Review, n.d.).
- The system is about choosing. You decide where the shadows, the face and the highlights should fall.
- The exposure half of the system works for every kind of photography. The other half, squeezing or stretching the tones on the negative by changing development, is for film only. Digital photographers use HDR and tone mapping for the same problem.
| Zone | Tone and detail | Example |
|---|---|---|
| 0 | Pure black, no detail | Deepest shadow |
| I | Near black, no visible texture | Very dark shadow |
| II | Very dark, a hint of texture | Deep shadows, dark hair |
| III | Dark, with texture | Dark bark, shaded sides of trees |
| V | Middle grey | Average of a meter reading |
| VII | Light, still with texture | Weathered white paint |
| VIII | Near white, minimal texture | Bright clouds, sunlit snow |
| X | Pure white, no detail | Bright light sources |
Table 4. Selected zones, from Photo Review’s description of Adams’s scale (Photo Review, n.d.).
Cham tipSay the zone out loud for each part of the scene: shadow, wall, face, cloud, light.
Cham taskLook at a scene and say the zone of five things. Then check each with a spot meter and add or subtract stops from the middle grey reading.
Check yourself: Which zone is middle grey, and what does a meter aim for?
Zone V. A meter treats every scene as if it were Zone V.
How do I use the Zone System with a digital camera?
Short answer. Meter the part you care about, decide which zone it should fall in, and shift the exposure by the number of stops between the meter's Zone V and your chosen zone. Then check the highlights on the histogram and the highlight alert. This is called placing a tone and letting the rest fall.
- Place: choose the zone for the key tone. A dark wall with texture is Zone III. A face in light is often around Zone VI.
- Fall: every other tone lands one stop per zone away from it.
- The meter assumes Zone V, so the shift is the number of zones from V.
- Check where the brightest part falls. If it is above Zone VIII it will clip.
- On film, Adams also changes the development time to move the contrast. A digital camera does this in the raw converter.
Worked example. You spot meter a shaded wall and the meter says f/8 at 1/125. That puts the wall on Zone V. You want it on Zone III, with texture. That is two stops less light, so shoot f/8 at 1/500. Then look at the brightest part. If the sky is above Zone VIII, it will be white. For more on spot metering, see How Metering Works.
| Place the reading on | Change from the meter reading |
|---|---|
| Zone III | −2 stops |
| Zone IV | −1 stop |
| Zone V | No change |
| Zone VI | +1 stop |
| Zone VII | +2 stops |
Table 5. Placing a spot reading on a zone. The meter assumes Zone V.
Cham tipAlways say the zone first. Then do the stops.
Cham taskSpot meter a shadow, then shoot it placed on Zone III. Check the histogram and the highlight alert.
Check yourself: The meter reads a dark wall as Zone V. You want it on Zone III. What do you do?
Give two stops less exposure than the meter says, for example 1/500 where it said 1/125.
Why shoot RAW?
Short answer. A RAW file holds the sensor data before the camera has turned it into a finished picture. You make the picture later, on a computer, so exposure and white balance can be adjusted with little loss. A JPEG is finished in the camera and leaves much less room to change it.
- A RAW file has more latitude than a JPEG. You can recover some highlight and shadow detail and change the white balance without damaging the file.
- The original data stays untouched. Your edits are saved as instructions, so you can always go back.
- It is future-proof to a degree. Better software in future can give a better result from the same file.
- Convert RAW files on a computer, not in the camera. A computer has far more processing power, so the conversion can be done better.
- A RAW file must be converted before it is printed or shared, and it is larger than a JPEG.
- Each camera maker has its own RAW format. Adobe DNG is an open format often used for long-term storage.
- RAW cannot rescue what the sensor never recorded. Clipped highlights stay white, so the exposure still has to be right.
| RAW | JPEG | |
|---|---|---|
| Finished | Later, on a computer | At once, in the camera |
| Exposure and white balance changes | Little or no loss | Limited, and can damage the picture |
| File size | Large | Small |
| Ready to print or share | No, convert it first | Yes |
Table 6. RAW and JPEG compared.
Cham tipIf you are unsure, shoot RAW plus JPEG for a few weeks and compare the two after editing.
Cham taskShoot one scene as RAW and as JPEG. In an editor, lower the highlights and lift the shadows on both. Compare the detail in each.
Check yourself: Why is a RAW file more flexible than a JPEG?
It holds the sensor data before processing, so exposure and white balance can be changed with little loss.
What is HDR?
Short answer. HDR, or high dynamic range imaging, combines several exposures of one scene into a single picture that holds more range than any one frame could. You shoot frames for the highlights and frames for the shadows, merge them, and then fit the result to a screen or print.
- Take three, five or seven frames with auto-bracketing. The set must include frames exposed for the highlights and frames exposed for the shadows.
- The wider the range of the scene, the more frames you need, or the further apart they must be spaced.
- Use aperture priority, so only the shutter speed changes. A changing aperture would change the depth of field and spoil the merge.
- Use a low ISO, and a tripod with a cable release or timer, so the frames line up.
- Anything that moves between frames leaves a ghost. Shoot when the area is quiet.
- True HDR makes a 32-bit file that must be tone mapped before a screen can show it. Tone mapping squeezes the huge range into a picture a display can hold. Overdone, it looks painterly and unreal.
- Exposure blending makes an ordinary 8-bit picture in one step. It can reduce noise, while tone mapping may increase it.
| True HDR | Exposure blending | |
|---|---|---|
| File made | 32-bit, needs tone mapping | 8-bit, ready to use |
| Steps | Two: merge, then tone map | One |
| Noise | May increase | May reduce |
| Look | Painterly if overdone | Usually natural |
Table 7. Two ways to merge bracketed exposures.
Cham tipCheck that your bracket reaches a frame with clean shadows. Noise in the shadows shows in the final merge.
Cham taskOn a tripod, shoot a room with a bright window at the metered exposure and two stops either side. Merge them by exposure blending and compare with the single frame.
Check yourself: Why use aperture priority when bracketing for HDR?
Only the shutter speed then changes. A changing aperture would change the depth of field and the frames would not match.
What are sensitometry and the characteristic curve?
Short answer. Sensitometry is the science of measuring how a photographic material responds to light. Its main tool is the characteristic curve, which plots density against the logarithm of exposure. The curve has a toe for the shadows, a straight line for the midtones and a shoulder for the highlights.
- Exposure is illuminance times time. For example 75 millilux for 1/15 s is 5 millilux seconds.
- Density is how dark the developed film is. A densitometer measures it.
- On a negative, the shadows fall on the toe, the midtones on the straight line and the highlights on the shoulder.
- The slope of the straight line shows the contrast. Development time, temperature, agitation and developer activity change it.
- Ferdinand Hurter and Vero Charles Driffield worked together in England and published a way to measure the speed and contrast of plates and film (Photographic Historical Society of Canada, n.d.).
- A raw digital file is a straight line until the sensor is full. The camera and the converter add a tone curve, which often has a toe and a shoulder like film.
| Part of the curve | Scene tones | On the negative |
|---|---|---|
| Toe | Shadows | Light, thin density |
| Straight line | Midtones | Steady rise of density |
| Shoulder | Highlights | Dark, dense, rises slowly |
Table 8. Where the tones fall on the curve of a negative.
Cham tipRemember the order: toe for shadows, line for midtones, shoulder for highlights.
Cham taskDraw an S curve in your notebook. Mark where a dark wall, a grey wall and a white cloud fall on it.
Check yourself: Where do the shadows of a scene fall on the curve of a negative?
On the toe, where the curve is low and flat.
How much dynamic range does each kind of photography need?
Short answer. Match the camera to the contrast of the scene. A flat scene fits in any camera, and a contrasty scene needs care. Treat every line below as a starting point.
- Birds. A bird against a bright sky is high contrast. Expose for the bird, let the sky go bright, and shoot raw to keep room for recovery.
- Animals and pets. Dark fur in bright sun is high contrast. Look for even light, such as open shade.
- Reptiles. Dappled light on rock is high contrast. Shoot in open shade for an even light.
- Insects and macro. A little flash or a reflector lifts the dark shadows among the plants.
- Portraits. Use open shade, a reflector or fill flash to bring the light on the face closer to the background.
- Fashion. In the studio, the lighting ratio sets the contrast. Keep it inside the range of the camera.
- Wedding and events. Indoors with a bright window, expose for the faces and add fill flash. Protect the dress.
- Product. Soft boxes and white cards keep the contrast inside the range of the camera.
- Automotive. Shoot on an overcast day or near sunrise and sunset. A polariser cuts reflections from paint and glass.
- Photojournalism. Shoot raw, so you can rescue highlights and shadows when there is no time to light the scene.
- Sports and action. Stadium lights against a dark crowd are high contrast. Shoot raw and protect the highlights.
- Landscape. Sunrise and sunset can exceed the range of the camera. Bracket and merge, or use a graduated ND filter.
- Street and documentary. Choose which end to protect, usually the highlights, and shoot raw.
- Night and astro. City lights against a dark sky are high contrast. Expose for the lights and lift the shadows in editing.
- Cinema. A cinema camera holds more stops than a stills camera, but the DOP still lights the face and the window to bring them closer.
Questions beginners ask
What is dynamic range?
The span from the brightest to the darkest tone, counted in stops. Each stop doubles the ratio, so 10 stops is 1,024 to 1.
What is the Zone System?
A system by Ansel Adams and Fred Archer that divides tones into eleven zones from 0 to X, one stop apart, with Zone V as middle grey.
What is HDR in photography?
HDR combines several exposures of one scene, some for the highlights and some for the shadows, into one picture that holds more range than a single frame can.
Why shoot RAW?
A RAW file keeps the sensor data before the camera processes it, so you can change exposure and white balance later with little loss.
References
- Adams, Ansel (1981) The Negative. Boston: New York Graphic Society. See the chapters on the Zone System.
- ARRI (2022) Dynamic range white paper. www.arri.com (dynamic range white paper, PDF)
- Photo Review. (n.d.) Ansel Adams’ classic Zone System. www.photoreview.com.au/tips/shooting/ansel-adams-classic-zone-system/
- Photographic Historical Society of Canada. (n.d.) Who the heck is Hurter? phsc.ca/camera/who-the-heck-is-hurter/
- Präkel, D. (2009) Basics Photography 07: Exposure. Lausanne: AVA Publishing. See the sections on subject brightness range (pp. 34–37), RAW files and high dynamic range imaging (pp. 126–135) and the Zone System (pp. 136–139).
How to cite this guide. Alex, A., & Joseph, A. (2026). Dynamic range: A guide for photographers and cinematographers. Creative Hut Academy. https://creativehut.org/library/dynamic-range/
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