OIS stabilizes mechanically by shifting lens or sensor elements before the image is captured. EIS (electronic image stabilization) corrects digitally after capture by cropping and realigning the frame, which reduces resolution. Many smartphones combine both for optimal results.
Camera
OIS (Optical Image Stabilization): Definition & explanation
In a nutshell
OIS mechanically compensates for hand shake by physically shifting lens or sensor elements. It delivers sharper low-light photos and smoother video without digital cropping or quality loss.
How does OIS (Optical Image Stabilization) work?
Optical Image Stabilization (OIS) uses gyroscope sensors to detect real-time movement of the smartphone. A small motor then shifts the lens or image sensor in the opposite direction of the detected shake, typically via magnets or piezoelectric actuators. This keeps the light path stable on the sensor during exposure, even with slight hand tremor.
The key advantage over purely digital stabilization (EIS) is that OIS acts before the image is captured, discarding no image data. This allows longer exposure times without blur, which matters most for night shots, telephoto zoom photos, and handheld video.
OIS systems vary in correction range and speed, usually measured in stops (e.g., 3–4 EV). Flagship smartphones often combine OIS with EIS for maximum stability: the optical stage handles large movements, while digital processing smooths the rest. This hybrid stabilization has become standard in premium camera systems.
Advantages of OIS (Optical Image Stabilization)
- Sharper low-light photos
- Blur-free handheld video
- No cropping unlike EIS
- Better zoom shots
- Enables longer exposure times
Disadvantages of OIS (Optical Image Stabilization)
- Adds hardware cost
- Requires more internal space
- Limited correction range
- No fix for strong movement
Frequently asked questions
Yes, especially if you often shoot in low light, use zoom, or record video. OIS makes the biggest difference for night shots and telephoto photos, where hand shake would otherwise cause blur.
No, typically only the main camera and sometimes the telephoto lens include OIS. Ultra-wide and front cameras usually rely on EIS only or have no stabilization due to space and cost constraints.
Guides with OIS (Optical Image Stabilization)
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