Dynamic range describes the range of brightness that a camera sensor can capture with accurate detail. The greater the dynamic range, the more detail is preserved in highlights and shadows. The ETTR (Expose To The Right) technique maximizes this range by slightly overexposing without clipping, which enables more image information and less noise. Sensors vary in dynamic range; modern full-frame models offer approximately 14–15 EV.
Category: Photography – Advanced Topics > 12. Camera & Technology – In-Depth Article ID: 12.1 Created: May 2026
The Essentials at a Glance
- Dynamic range describes the range of brightness that a sensor can capture simultaneously with accurate detail—from the deepest black to bright white
- The greater the DR, the more detail is preserved simultaneously in highlights and shadows
- The most important technique for maximizing it: ETTR (Expose To The Right)—slightly overexpose without clipping
Explanation
What Is Dynamic Range?
Dynamic range (DR) is the ratio between the brightest and darkest tone that a sensor can still capture with discernible detail. It is measured in stops (EV / exposure values) or as a ratio.
Typical DR values:
- Human eye (adapted): ~20–24 EV
- Modern full-frame sensor: ~13–15 EV
- Compact camera: ~10–12 EV
- Smartphone: ~10–12 EV (higher with multi-frame HDR)
What this means in practice: In a scene with 14 EV of contrast (e.g., bright sky + dark shadow), a sensor with 13 EV of DR cannot capture everything simultaneously. Either the sky is blown out or the shadows are crushed.
ETTR – Expose To The Right
ETTR is the most important technique for maximizing usable image information:
The histogram is shifted as far to the right as possible (expose brighter) without clipping the highlights. Why?
- More signal in bright areas: Sensors capture light linearly—in the bright tonal ranges, more gradations are stored than in the dark ones. The upper exposure stop contains 50% of all image values.
- Less noise: Brighter exposures have significantly less noise, which would become visible when darkening the image later in post-processing.
- More detail in shadows: In RAW processing, bright areas can be darkened without loss of quality; conversely, brightening shadows introduces noise.
How to perform ETTR:
- Set exposure compensation so that the histogram reaches just short of the right edge
- Enable the highlight-clipping warning (→ Article C.3)—important highlights must not clip
- In RAW processing, reduce the highlights until the image looks correct
ETTR is only for RAW—with JPEG, the bright areas have already been rendered; an overly bright JPEG can hardly be recovered.
Sensor DR in Practice
Not every sensor makes equally good use of its theoretical DR:
| Sensor Type | Typical DR | Strength |
|---|---|---|
| Full-frame BSI CMOS (modern) | 14–15 EV | Shadows can be brightened very well |
| APS-C BSI CMOS | 12–14 EV | Very good for its class |
| Micro Four Thirds | 11–13 EV | Good, but less than full frame |
| Compact/Smartphone | 10–12 EV | Limited—HDR algorithms help |
BSI (Back-Side Illuminated): Newer sensor technology in which the circuitry is located behind the light-sensitive surface → more light is captured → better DR and less noise.
When DR Optimization Is Especially Important
- Sunrise/sunset (extreme contrast range)
- Interiors with windows (dark inside, bright outside)
- Backlit shots
- Photojournalism under mixed lighting conditions
Alternatives When DR Is Not Sufficient
- Exposure bracketing + exposure blending (→ Article 11.6)
- HDR (→ Article 8.8)
- Graduated neutral-density filter (GND) in front of the lens
Practical Tip
Shadow-brightening test: Deliberately underexpose a RAW photo by 2 stops, then increase the shadows by +100 in Lightroom. If this does not produce distracting noise, the sensor has very good DR. This test also shows up to which ISO value this still works—practical knowledge for difficult lighting situations.