What Is Image Stabilization (OIS/EIS)?
Image stabilization is a technology that counteracts the natural shake of your hands to produce sharper photos and smoother video. It comes in two main flavors: OIS (Optical Image Stabilization), which physically moves lens elements or the sensor to compensate for movement, and EIS (Electronic Image Stabilization), which uses software processing and frame cropping to achieve a similar effect digitally. Most modern smartphones and cameras use one or both methods to help you capture clear, blur-free images – even when you’re shooting handheld in less-than-ideal conditions.
Without stabilization, even a slight tremor in your hand can cause noticeable blur, especially at slower shutter speeds or longer focal lengths. Image stabilization doesn’t replace a tripod, but it dramatically extends the range of situations where you can shoot handheld and still get sharp results.
In-Depth
OIS: Optical Image Stabilization
OIS works by physically moving components inside the camera to counteract detected motion. There are two main implementations:
Lens-shift OIS moves a group of lens elements in the opposite direction of the detected shake. When the camera detects your hand moving slightly to the right, the stabilization system shifts a lens element to the left, keeping the image centered on the sensor. This is the most common approach in smartphone cameras and interchangeable-lens camera lenses.
Sensor-shift OIS (IBIS – In-Body Image Stabilization) moves the image sensor itself rather than the lens. This approach is popular in mirrorless cameras because it works with any lens you attach – even vintage or third-party lenses that don’t have their own stabilization. IBIS systems typically operate on five axes: pitch (vertical tilt), yaw (horizontal tilt), roll (rotation), and X/Y translation (horizontal and vertical shift).
| OIS Type | How It Works | Advantage |
|---|---|---|
| Lens-shift | Moves lens elements | Effective at long focal lengths; works in the viewfinder |
| Sensor-shift (IBIS) | Moves the image sensor | Works with any lens; 5-axis compensation |
The effectiveness of OIS is measured in “stops” of compensation. A system rated at 5 stops means you can use a shutter speed 5 stops slower than normal and still get a sharp image. For example, if you’d normally need 1/250s for a sharp handheld shot at a given focal length, 5-stop OIS would let you shoot at 1/8s and still get usable results – a huge advantage in low light.
EIS: Electronic Image Stabilization
EIS doesn’t move any physical components. Instead, it uses the camera’s processor and software to stabilize the image:
- The sensor captures a slightly wider field of view than the final image.
- Software analyzes frame-to-frame motion using gyroscope data and pixel analysis.
- The software shifts, warps, or crops the image to compensate for detected movement.
- The stabilized, cropped image is output as the final result.
The main trade-off is clear: EIS sacrifices some of your field of view because it needs that extra margin around the edges to perform the stabilization crop. Depending on the aggressiveness of the stabilization, you might lose 10-20% of your frame. Some aggressive EIS modes crop even more, which can make the image look noticeably more zoomed in.
EIS also works best for video rather than still photos. In video, the software can analyze motion across multiple consecutive frames, which gives it more data to work with. For still photos, EIS is less effective because there’s only one frame to work with.
OIS vs. EIS: Head-to-Head
| Feature | OIS | EIS |
|---|---|---|
| Still photo quality | Excellent – no crop, no artifacts | Limited benefit for stills |
| Video smoothness | Very good for minor shake | Good for moderate movement |
| Field of view | No crop | 10-20% crop |
| Low-light performance | Excellent – allows slower shutter speeds | Minimal benefit – can’t gather more light |
| Cost | Higher (physical hardware) | Free (software only) |
| Power consumption | Slightly higher | Minimal |
| Weight/size | Adds hardware to lens or body | None |
| Artifact risk | Minimal | Warping, jelly effect possible |
The Jelly Effect and EIS Artifacts
One of EIS’s notable weaknesses is the “jelly” or “wobble” effect, particularly with CMOS sensors that use a rolling shutter. Since the sensor reads the image line by line from top to bottom (rather than all at once), fast horizontal movements can cause vertical lines to appear slanted or wobbly. When EIS tries to correct for motion on top of rolling shutter distortion, the results can look unnatural – especially in footage with rapid panning or vibration.
Modern flagship devices have largely minimized this issue through faster sensor readout speeds and improved algorithms, but it can still appear in budget devices or extreme motion scenarios.
Hybrid Stabilization
Many modern devices combine OIS and EIS for the best of both worlds:
- OIS handles the physical stabilization: Keeps the image steady at the hardware level, preserving full frame data and helping in low light.
- EIS applies additional software smoothing: Cleans up any remaining micro-jitter and can apply more aggressive smoothing for walking or running shots.
This hybrid approach is now standard on most flagship smartphones and many mirrorless cameras. The combination produces noticeably smoother video than either method alone, especially during handheld walking shots.
Gimbal-Level Stabilization Without a Gimbal?
Recent advancements have blurred the line between built-in stabilization and external gimbal stabilization:
- Sensor-shift plus AI: Some phones use oversized sensors with aggressive sensor-shift OIS combined with AI motion prediction to deliver what manufacturers call “gimbal-like” stabilization.
- Floating lens elements: Certain camera modules suspend the entire lens assembly on a gimbal-like magnetic mount, allowing much wider range of movement than traditional OIS.
- Predictive stabilization: Using AI to anticipate your next movement (based on motion patterns) and preemptively adjust the stabilization, rather than purely reacting to detected shake.
These technologies have gotten impressively good. For casual walking shots and vlogging, the best built-in stabilization systems are approaching what a basic external gimbal delivers. However, for professional-quality tracking shots, running sequences, or any situation involving large or sustained motion, a dedicated gimbal still produces noticeably superior results.
Stabilization Ratings: What the Numbers Mean
When a manufacturer claims “7-stop stabilization” or “5.5-axis IBIS,” here’s what they mean:
- Stops: Each stop represents a doubling of the exposure time you can use handheld. The CIPA (Camera & Imaging Products Association) standard defines how these are measured, though real-world results often differ from lab conditions.
- Axes: Refers to the number of directions the stabilization can compensate for. 5-axis means pitch, yaw, roll, horizontal shift, and vertical shift.
- Synergy ratings: When a stabilized lens is paired with sensor-shift IBIS in the camera body, manufacturers may quote a synergy rating (e.g., “8 stops with synergistic control”). These are the best-case numbers and require specific lens-body combinations.
How to Choose
1. Prioritize OIS for Photography and Low Light
If still photography or low-light shooting is important to you, optical image stabilization is non-negotiable. OIS is the only stabilization type that actually helps you gather more light by allowing slower shutter speeds. For cameras, look for sensor-shift IBIS if you want stabilization with every lens you own. For smartphones, check whether OIS is present on the main and telephoto lenses – not just the wide-angle.
2. Look for Hybrid Stabilization for Video
For video shooting, you want both OIS and EIS working together. Check review footage to see how well the hybrid system performs during real-world walking shots – spec numbers alone don’t tell the full story. Pay attention to the crop factor that EIS introduces; some devices crop so aggressively in their “super steady” video modes that the field of view becomes impractically narrow.
3. Know When You Still Need a Gimbal
Built-in stabilization has improved enormously, but it has limits. If you regularly shoot while running, cycling, or moving through uneven terrain – or if you need that perfectly smooth, cinematic tracking look – a dedicated gimbal is still the right tool. Think of built-in stabilization as handling the everyday cases and a gimbal as the specialist tool for demanding motion work.
The Bottom Line
Image stabilization is one of those technologies that you notice most when it’s absent. OIS physically compensates for camera shake at the hardware level, excelling in low light and still photography. EIS uses software to smooth video at the cost of some field of view. The best modern devices combine both methods for impressive handheld results. For most people, a good hybrid OIS + EIS system handles the vast majority of shooting situations – but for the smoothest possible motion footage, nothing replaces a proper gimbal.