Dynamic range is the span between the darkest and the brightest tones that can be recorded with detail, measured in stops. Every stop is a doubling of light, so a camera with 12 stops of dynamic range can hold detail in highlights about 4,096 times brighter than its darkest recordable shadows. When a scene has more range than the camera, something has to give: the brightest parts clip to pure white, the darkest sink to black, or both.
The term is used in three places, and it helps to keep them apart. The scene has a dynamic range (a sunlit sky above a shaded valley has a lot, a foggy morning very little). The camera has a dynamic range (how much of that the sensor can record in one exposure). And the output, a screen or a print, has its own, usually smaller again. Most of the work in photography with high contrast light is fitting the first into the second, then the second into the third.
See it: fit a scene into the sensor
Slide the exposure and watch what clips at each end, change how many stops the sensor holds, then bracket three frames and merge them. The range bar shows the scene in stops, with the sensor’s window laid over it.
Dynamic range in stops: what the numbers mean
Because each stop doubles the light, dynamic range grows fast. A difference of a few stops between two cameras is a large difference in what each can hold.
| Stops | Brightest to darkest | Where you meet it |
|---|---|---|
| 5 | 32 to 1 | A foggy or flat overcast scene |
| 7 | 128 to 1 | Soft light on a subject with no sky in the frame |
| 10 | 1,024 to 1 | A sunlit landscape with some shade |
| 12 | 4,096 to 1 | Backlit portrait, sunset over land |
| 14 | 16,384 to 1 | Raw files from many current sensors at base ISO |
| 17 | 131,072 to 1 | A dim room with a sunlit window in the frame |
| 20 | 1,048,576 to 1 | Streetlights and deep shadow at night |
The scene values are rough guides; real scenes vary a lot. The point is the shape: everyday scenes run from about 5 to 20 stops, and a single exposure from a good sensor covers somewhere in the middle of that.
What sets a camera’s dynamic range
A sensor’s range has a ceiling and a floor. The ceiling is the point where each photosite is full and records pure white; any more light is lost, which is clipping. The floor is the noise the sensor and its electronics add on their own. Detail darker than that noise cannot be told apart from it. Dynamic range is the distance between the two.
- ISO. A camera has its widest range at its lowest native ISO. Raising the ISO brings the clipping point down while the noise floor stays roughly where it is, so each stop of ISO above base costs close to a stop of highlight room. Shoot high contrast scenes at base ISO when you can.
- Sensor size and design. A larger sensor collects more light in total, which tends to give it a little more range than a smaller sensor of the same generation. Sensor design matters at least as much, which is why a newer small sensor can match an older large one. See sensor size for the wider trade-offs.
- Raw or JPEG. A raw file keeps everything the sensor recorded. A JPEG applies a contrast curve and throws the rest away, so it holds a few stops less of usable range. If a scene is close to the camera’s limit, shoot raw.
- Bit depth. A 14 bit raw file has room for more levels than a 12 bit one, but bit depth is a container, not a source. It cannot hold range the sensor did not capture.
Two common claims are wrong. More megapixels do not give more dynamic range, and an expensive lens does not add any either (although a lens that flares can lower contrast and fog the shadows).
Why does a lifted shadow look grainy while a bright area looks clean? ISO invariance explains where the noise in a dark exposure comes from and when brightening later costs nothing.
How to tell if a scene is beyond your camera
Do not judge by the screen on the back of the camera; its brightness depends on the setting and the light around you. Use the tools made for it.
- The histogram. If the histogram is pressed against both edges at once, with a spike at the right and a spike at the left, the scene has more range than one exposure can hold.
- Highlight warnings. Turn on the blinking highlight warning in playback (or zebras in the viewfinder, if your camera has them). Blinking areas have no detail.
- Spot readings. Spot meter the brightest area that must keep detail and the darkest that must keep detail. The difference in stops is the scene’s working range. If it is more than your camera holds, plan for it.
The histogram and warnings are built from a JPEG preview, so a raw file usually has a little more highlight room than they suggest. Learn how much your own camera has by testing it, not by guessing.
Exposing for the most range in one shot
Highlights and shadows fail differently. A clipped highlight is gone; there is no data to recover. A dark shadow still has data, just noisier. That is why the usual advice is to protect the highlights and let the shadows fall where they fall.
- Set base ISO.
- Expose as brightly as you can without clipping the highlights that matter. This is called exposing to the right, because it pushes the histogram toward the right edge. More light means cleaner shadows.
- Decide what is allowed to clip. A bare light bulb or the sun itself can go white. A bride’s dress or a cloud should not.
- In editing, pull the highlights down and lift the shadows. Highlight recovery works only on highlights that were not truly clipped.
Want the detail on reading the graph? The histogram guide shows what each shape means and how to read it in the field.
When the scene has more range than the sensor
Sometimes no single exposure will hold the bright sky and the dark foreground together. You have five ways to deal with it.
1. Choose what to lose
Not every picture needs detail everywhere. Expose for the sky and let a figure become a silhouette, or expose for a face and let the window behind go white. A clear decision often makes a stronger picture than a compromise. Backlighting and silhouettes covers this deliberately.
2. Darken the bright part with a graduated filter
A graduated ND filter is dark at the top and clear at the bottom. Lined up on the horizon, it holds back a bright sky by two or three stops while the land is untouched, so one exposure fits. A plain ND filter does not help: it darkens the whole frame equally and leaves the range unchanged.
3. Bracket and merge
Bracketing means taking the same frame at several exposures, then merging them in software into one image that holds the range of all of them. A merge of frames spread across a total of N stops adds about N stops to what one frame holds. Three frames at minus 2, 0 and plus 2 cover 4 extra stops, so a 12 stop sensor can hold a scene of about 16. Use a tripod, keep the aperture the same across frames, and change the shutter speed between them. Moving subjects such as leaves and people can leave ghosts; most merging software has a deghosting option.
The merged result is an HDR image. It then has to be squeezed back into the range a screen or print can show, which is tone mapping. Done gently it looks like what you saw. Pushed hard it gives the gray halos and flat, glowing look that gave HDR a bad name.
Would you rather blend the frames by hand, with full control of each area? Exposure blending covers combining exposures with masks instead of an automatic merge.
4. Add light to the shadows
Instead of holding back the highlights, raise the shadows. A reflector or fill flash lifts a backlit face toward the brightness of the sky behind it, shrinking the scene’s range at the source. This works for portraits and close subjects; it does nothing for a distant valley.
5. Wait for better light
The scene’s range changes through the day. Thin cloud, the hour around sunset or the light after the sun drops below the horizon can bring a scene within reach of one exposure. Waiting is often the simplest answer.
Dynamic range on film
Film has its own range, usually called latitude. Color negative film is forgiving of overexposure and can hold detail several stops above a normal exposure, which is why it handles bright skies well. Slide film is much less forgiving, closer to five stops of usable range, and needs careful exposure for the highlights. Digital sensors behave more like slide film at the top end: once highlights clip, they are gone. Film photography covers the differences between stocks.
Common mistakes
- Trusting the camera’s screen. A bright screen in a dark place makes everything look fine. Check the histogram and highlight warnings.
- Raising ISO in high contrast light. Every stop above base costs range. Use a tripod and a slower shutter speed if the subject is still.
- Using a plain ND filter to fix a bright sky. It darkens everything equally. A graduated filter or bracketing is what you need.
- Clipping the highlights to keep the shadows clean. Shadows can be lifted; clipped highlights cannot be brought back.
- Lifting every shadow to full brightness. A scene with no dark areas looks flat. Keep some deep shadow for depth.
- Shooting JPEG in a scene near the limit. Raw holds more of the range and leaves room to recover it.
Try this
Ten minutes, any camera. Stand inside a room and frame a window with a sunlit view and some of the dark wall around it. Set base ISO and take five frames: one metered, then minus 2, minus 1, plus 1 and plus 2 stops. Turn on highlight warnings and look at each frame and its histogram. Find the frame where the view outside first stops blinking, and the frame where the wall first shows detail. The number of stops between those two frames, added to what one frame holds, is roughly the range of the scene. If you have merging software, merge all five and compare the result to the metered frame.
Photographing people in the street against bright and dark backgrounds? Using dynamic range in street portraits shows how to place a face against bright and dark backgrounds.
Frequently asked questions
What is dynamic range in a camera?
It is the number of stops between the brightest tone the sensor can record before clipping and the darkest tone it can record above its own noise. Many current sensors hold around 12 to 14 stops at base ISO in a raw file. The number falls as ISO rises.
What is a good dynamic range for a camera?
Measured figures vary with how they are tested, so compare cameras on the same test rather than on brochure numbers. In practice, any camera with around 12 or more stops at base ISO handles most daylight scenes, and bracketing covers the rest. Technique (base ISO, careful exposure, raw files) makes more difference than a stop between two bodies.
Does a higher ISO reduce dynamic range?
Yes. Raising ISO amplifies the signal, so highlights clip sooner while the noise floor in the shadows stays close to where it was. The camera loses close to a stop of range for each stop of ISO above its base setting.
Is HDR the same as dynamic range?
No. Dynamic range is a measurement of the span of tones. HDR, high dynamic range, is a technique: combining several exposures, or processing one raw file, so an image holds more range than one normal exposure would. The result is then tone mapped so a screen or print can show it.
Does a raw file have more dynamic range than a JPEG?
A raw file keeps the full range the sensor recorded. A JPEG applies a contrast curve and discards data beyond it, so it holds less, often several stops less. That missing range is what highlight and shadow recovery in a raw editor draw on.
Why does my photo lose detail in the sky?
The sky is much brighter than the land, often by more stops than one exposure can hold. If you exposed for the land, the sky clipped. Expose for the sky and lift the land in editing, use a graduated filter, or bracket and merge.