Image stabilization uses motion sensors and a moving lens element or a moving sensor to cancel the small shakes of your hands, so you can hand-hold at slower shutter speeds and still get sharp pictures. It matters most in dim light and with long lenses, but it corrects camera movement only, never subject movement. Leave it on for handheld shooting, use a panning mode (or switch it off) when you pan, and turn it off on a tripod unless your camera’s manual says it detects tripods automatically.
What stabilization corrects and what it cannot
When you hold a camera, your hands, pulse and breathing make it rotate very slightly during the exposure. The two rotations that matter most are pitch (the lens tipping up and down) and yaw (the lens swinging left and right). A third, roll, is the camera turning around the lens axis, as it does when you press the shutter button hard. The whole camera can also shift a little up, down or sideways without rotating.
A stabilizer measures this movement many times per second with gyroscopic sensors and moves either a small group of lens elements or the sensor itself in the opposite direction, so the image stays still on the sensor while the camera wobbles. That is the whole trick: the camera still moves, but the picture of the scene does not move across the pixels.
What stabilization cannot do is just as important:
- It cannot freeze a moving subject. A walking person, a moving car or leaves in the wind will blur at a slow shutter speed no matter how steady the camera is. Only a faster shutter speed or flash freezes subject motion.
- It cannot fix missed focus. A picture that is soft because the focus landed on the wrong spot stays soft.
- It cannot handle large movements. It is built for small tremors. Walking, a swaying boat or a big jolt as you stab the button can exceed its range.
- It adds nothing at fast shutter speeds. At 1/1000 second with a normal lens, your hands do not move far enough during the exposure to blur anything, so stabilization has nothing left to fix. It still steadies the viewfinder.
Why long lenses shake more: the focal length lever
The same tiny tilt of the camera moves the image further across the sensor the longer the focal length. The distance is the focal length multiplied by the tangent of the angle, so doubling the focal length doubles the blur. This table uses a tilt of 0.1 degree, a small wobble, and a full-frame sensor of 24 megapixels, where each pixel is 0.006 mm wide (36 mm divided by 6,000 pixels).
| Focal length | Image moves on the sensor | That is about |
|---|---|---|
| 16mm | 0.028 mm | 5 pixels |
| 24mm | 0.042 mm | 7 pixels |
| 50mm | 0.087 mm | 15 pixels |
| 100mm | 0.17 mm | 29 pixels |
| 200mm | 0.35 mm | 58 pixels |
| 600mm | 1.05 mm | 175 pixels |
Three things follow from this one table. It is why the reciprocal rule ties the safe shutter speed to focal length. It is why a stabilizer for a long telephoto has to move the image a long way, more than a full millimeter at 600mm. And it is why a sensor on a floating platform, which can only travel a few millimeters, runs out of room at long focal lengths sooner than a stabilizer designed into the telephoto lens itself. Add more megapixels and the same blur covers more pixels, which is why very high resolution sensors show shake that a lower resolution sensor hid.
Feel the lever in the camera simulator: zoom to 200mm or longer and get a shake-free, well exposed shot handheld, with stabilization off.
Roll and shift: the corners and close-ups
Roll behaves differently. When the camera turns around the lens axis, the center of the frame barely moves while the corners swing in an arc, so roll blur is zero in the middle and worst at the edges. That is why a wide-angle shot at a slow speed can be sharp in the center and smeared in the corners. A lens stabilizer cannot correct roll at all, because sliding a glass element cannot rotate the image. A sensor platform can rotate, so it can.
Shift, the whole camera moving sideways without tilting, hardly matters for distant subjects but dominates close up. The image moves by the shift multiplied by the magnification. With a 50mm lens focused at 10 meters, magnification is about 1/200, so a 1 mm sway moves the image 0.005 mm, under one pixel. In macro photography at life size (1:1), the same 1 mm sway moves the image a full millimeter, about 170 pixels. Some stabilized lenses and bodies add accelerometers to correct shift, but it remains the hardest movement to cancel, which is why close-up work gains the least from stabilization.
How a stabilizer works inside
The loop has three parts. Gyroscopic sensors measure how fast the camera is rotating, not where it is pointing. A processor adds up those rates over time to work out the angle, and from the angle and the focal length it calculates how far the image has moved. Small electromagnets (voice coils) then move the lens group or sensor platform by that amount, with position sensors checking that it arrived where it was sent.
Because the system adds up rates, tiny measurement errors add up too. Over a fraction of a second this drift does not matter. Over a second or two, the stabilizer’s idea of “still” wanders, and it can no longer hold the image exactly in place. That is one reason ratings level off and why handheld exposures of several seconds stay hit and miss however good the system is.
It is also why a camera with in-body stabilization needs to know the focal length. With a modern lens it is reported automatically. With an old manual lens, enter the focal length in the camera menu, or the system will move the sensor by the wrong amount, which makes stabilization less effective or even adds blur.
Lens stabilization and sensor stabilization
There are two ways to build a stabilizer, and many cameras now use both together.
Lens-based stabilization moves a small group of elements inside the lens. It is designed for that lens’s focal length, which makes it particularly effective on long telephotos, where the image needs to be shifted a long way. On a camera with an optical viewfinder, it is the only kind that steadies the view through the eyepiece, which makes framing a distant subject much easier. The full explanation is in optical image stabilization (OIS).
Sensor-based stabilization, usually called IBIS (in-body image stabilization), mounts the sensor on a floating platform. Every lens you attach is stabilized, including old manual lenses and fast primes that were never made with stabilization. It can correct roll as well as pitch and yaw. Its limit is travel: with a very long lens the sensor would have to move further than the mechanism allows, so its benefit shrinks at long focal lengths.
| In the lens | In the body | |
|---|---|---|
| Works with | That lens only | Any lens you mount |
| Best at | Long telephotos | Wide to short telephoto, including manual lenses |
| Pitch and yaw | Yes | Yes |
| Roll | No | Yes |
| Optical viewfinder | Steadied | Not steadied |
| Electronic viewfinder and screen | Steadied | Steadied |
When a stabilized lens is mounted on a body with IBIS, many systems coordinate the two: both share the work on pitch and yaw, and the sensor adds roll. This usually gives a larger benefit than either alone. Without coordination, two stabilizers correcting the same shake can overcorrect, so check whether your lens and body are designed to work together, and if not, use one of them.
Comparing the two systems in detail? How in-body stabilization works covers the moving sensor, and lens stabilization covers why telephotos keep their own.
What “stops of stabilization” really means
Stabilization is rated in stops, the same unit used for exposure. Each stop doubles the shutter time you can use for the same sharpness. Starting from the shutter speed you would need without stabilization, you count down one halving at a time.
A worked example: with a 100mm lens on a full-frame camera, the reciprocal rule suggests 1/100 second or faster for a sharp handheld shot. With 4 stops of stabilization, count four doublings: 1/50, 1/25, 1/13, 1/6. In theory you can now hand-hold at about 1/6 second.
| Stops of benefit | Slowest speed from a 1/100 starting point |
|---|---|
| 0 (off) | 1/100 |
| 2 | 1/25 |
| 3 | 1/13 |
| 4 | 1/6 |
| 5 | 1/3 |
| 6 | about 2/3 second |
Then turn it on: with Handheld + IS, use a shutter speed of 1/8 or slower and still get no visible shake.
Want to see four stops of stabilization on a picture? In the camera simulator, switch Support between Handheld and Handheld + IS on the Night street scene and slow the shutter.
What the rating measures, and what it leaves out
Ratings come from a standardized test: the camera sits on a machine that reproduces typical hand shake, and frames are judged for blur with and without stabilization. Knowing the test tells you how to read the number:
- It is mostly about rotation. The rating measures pitch and yaw (and in newer versions of the test, roll). “Five-axis” describes which movements the system tries to correct. It does not mean all five are in the number, and it does not mean five times better.
- It is measured at one setting. A zoom is rated at a stated focal length, and a body’s rating is quoted with a particular lens. Other lenses and other focal lengths can give more or less.
- Lens and body ratings do not add up. A 5 stop lens on a 7 stop body is not 12 stops. When the two work together, the maker quotes a single combined figure for that pairing.
- It is a best case. Real hands vary with stance, fatigue, cold and how heavy the lens is. At the slowest rated speed, a good share of frames will still be slightly soft.
The practical approach is to plan on 1 to 2 stops less than the rating, shoot a short burst at slow speeds and keep the sharpest frame.
Finding your real slowest shutter speed
Two different limits decide how slow you can go. The first is camera shake, which stabilization helps. The second is subject motion, which it does not. Your shutter speed has to satisfy whichever limit is stricter.
The camera shake limit
Start with the reciprocal rule: 1 divided by the focal length. On a crop-sensor camera, multiply the focal length by the crop factor first, because the narrower view magnifies shake just as a longer lens would. A 50mm lens on a 1.5x crop body behaves like 75mm, so start at about 1/80 second. If you will inspect the picture at 100 percent on a very high resolution sensor, double that starting speed. Then subtract the stops your stabilization gives you, minus a margin.
The subject motion limit
These starting points assume a normal lens and a subject crossing the frame at a normal distance. Closer subjects or longer lenses need faster speeds.
| Subject | Starting shutter speed |
|---|---|
| Buildings, landscapes, still life | No limit from the subject; only shake matters |
| People posing or talking | 1/125 |
| People walking | 1/250 |
| Running, children playing, sports | 1/500 to 1/1000 or faster |
| Birds in flight, fast vehicles | 1/1000 to 1/2000 or faster |
Putting it together: one worked answer
A 100mm lens on a 1.5x crop body, a high resolution sensor, and a stabilizer rated at 5 stops:
- Equivalent focal length: 100 × 1.5 = 150mm, so the reciprocal rule gives 1/150. The nearest standard speed is 1/160.
- High resolution doubling: 1/320.
- Usable stabilization: 5 stops rated minus a 1.5 stop margin = 3.5 stops. 320 divided by 2 to the power 3.5 (about 11.3) is about 28, so roughly 1/30 second.
- Subject check: a building or a still life has no subject limit, so 1/30 is your answer. A person talking needs 1/125, so the subject wins and stabilization adds nothing to sharpness for that shot.
Whichever number is faster is the one you use. Stabilization still steadies the viewfinder when the subject limit wins, so there is rarely a reason to switch it off. See photographing moving subjects for choosing between freezing motion and showing it.
When the shake limit is the one that counts, stabilization gives you room in the exposure triangle. Each stop is a stop you do not have to add with ISO, which means less noise, or a stop you can spend on a smaller aperture for more depth of field: four stops lets you shoot a static scene at f/8 instead of f/2 in the same light and at the same ISO, by using a shutter speed four stops slower (1/6 instead of 1/100 with the 100mm example above).
Telling shake from other kinds of blur
Before blaming the stabilizer, look at the blurry frame at 100 percent and ask which of three patterns it shows. This is the fastest way to know what to fix.
| What you see | Cause | Fix |
|---|---|---|
| Everything doubled or streaked in the same direction, background included | Camera shake | Faster shutter, stabilization on, better technique or support |
| Background crisp, only the moving subject streaked | Subject motion | Faster shutter or flash; stabilization cannot help |
| Soft with no direction, and something nearer or further is sharp | Missed focus | Check the focus point; stabilization cannot help |
| Center sharp, corners smeared in an arc | Roll shake | Gentler shutter press; sensor stabilization corrects it, lens stabilization does not |
Is it shake, or did the focus land somewhere else? Camera shake walks through diagnosing blur and the handholding techniques that add to stabilization, and how to take sharp photos covers every cause of softness.
Stabilization modes and panning
Many lenses and cameras offer more than one stabilization mode. Names vary, but the ideas are consistent:
- Standard mode corrects movement in all directions. Use it for almost all handheld still photography.
- Panning mode stabilizes only the axis perpendicular to your pan. When you swing the camera horizontally to follow a cyclist, it leaves the horizontal movement alone and only corrects vertical wobble. Many systems detect a pan automatically. Without a panning mode, standard stabilization can fight your intentional movement and produce jerky or doubled results.
- Exposure-only mode, where available, keeps the viewfinder image unstabilized for tracking fast, erratic subjects such as birds or aircraft, and applies stabilization only at the moment of exposure.
- Active or vehicle mode, where available, is tuned for the larger, slower movements of shooting from a moving car or boat or while walking, especially for video.
Stabilizers need a moment to settle. Half-press the shutter button, wait a fraction of a second until the viewfinder image looks steady, then press fully. Stabbing the button in one quick motion wastes part of the benefit and adds roll.
Following a moving subject on purpose? Panning photography covers the swing, the shutter speeds and where panning mode earns its keep, and air show photography puts it to work on fast aircraft.
When to turn stabilization off
This is the question most people are really asking. The honest answer is that it depends on your system, so check the manual for your lens and camera. These rules cover most situations:
- Handheld, any shutter speed: Stabilization: On. Why: It steadies the viewfinder and helps at slow speeds.
- Solid tripod, long exposures: Stabilization: Off, unless your manual says it detects tripods. Why: Some systems can drift or add blur when there is no shake to correct.
- Tripod on a moving surface (bridge, pier, wind): Stabilization: Test both. Why: Some modern systems handle this well.
- Panning to follow motion: Stabilization: Panning mode, or off. Why: Standard mode can fight the pan.
- Beanbag or monopod: Stabilization: On. Why: These supports still allow some movement.
- Motorized gimbal for video: Stabilization: Follow the gimbal’s guidance. Why: Two stabilizers can interfere with each other.
- Multi-shot high resolution modes: Stabilization: Usually disabled automatically. Why: The sensor has to move in precise, planned steps.
Why can a stabilizer hurt on a tripod? Early systems were designed on the assumption that some shake is always present. When the camera is perfectly still, the drift described above and the system’s own tiny corrections can show up as slight blur during a long exposure. Many newer lenses and bodies detect a tripod and switch themselves off or change behavior. If you are not sure, test it: on a tripod, shoot the same scene at 1 second and 10 seconds with stabilization on and off, and compare at 100 percent. Your own results are more reliable than any general rule. For everything else about working with legs, see how to use a tripod.
Electronic stabilization, phones and video
Not every “stabilization” moves glass or a sensor. Electronic stabilization records a slightly larger area than the final frame and moves the crop to counter shake. It works well for video, where it removes the jitter between frames, but it narrows your field of view, and it cannot remove blur inside a single frame. In dim light that leaves smeared frames that look odd once the jitter is gone. Phones often combine a small optical stabilizer with electronic stabilization, and their night modes take a rapid series of short exposures and align them in software, which is a different trick from steadying one long exposure.
Video is more demanding than stills because shake is visible for the whole clip rather than during one short exposure. Optical and sensor stabilization work as they do for stills and do not reduce image quality. For walking shots, external stabilizers such as gimbals handle movement far beyond the range of built-in systems. With very wide lenses, sensor stabilization in video can produce a slight wobble in the corners, because the system corrects the center of the image while the distorted edges move differently. If you see it, try lens-based or electronic stabilization instead.
Shooting clips as well as stills? Video for photographers covers shutter speed, frame rates and the rest of the switch.
Common mistakes
- Expecting stabilization to freeze a moving subject. It steadies the camera only. Choose the shutter speed for the subject first, then let stabilization handle the shake.
- Trusting the full rating on every frame. The rating is a best case, measured at one setting. Plan on 1 to 2 stops less and shoot a burst when the picture matters.
- Adding lens and body ratings together. They do not add. Use the combined figure for your pairing, minus a margin.
- Expecting the same benefit at every focal length. In-body systems give the most at wide and normal focal lengths and less at long telephoto, and every system gives the least in close-up work.
- Leaving standard mode on while panning. Switch to panning mode, or turn stabilization off if your gear has no such mode.
- Forgetting the focal length setting with manual lenses. Sensor stabilization needs the correct focal length. Enter it each time you change lenses.
- Pressing the shutter instantly. Half-press and give the system a moment to settle before you take the picture.
- Neglecting technique because the camera is stabilized. A good stance, a gentle shutter press and bracing against something still add their benefit on top of stabilization.
Try this: measure what your stabilizer really gives you
Choose a static subject with fine detail, such as printed text on a poster or a brick wall, in shade or indoors. Set your lens to a known focal length, use shutter priority, and work out your reciprocal-rule speed (remember the crop factor).
With stabilization off, take three handheld frames at that speed, then three at each speed one, two, three and four stops slower. Turn stabilization on and repeat the set. That is 30 frames and about 10 minutes.
To judge the result, view each frame at 100 percent and count how many of each three are sharp. The slowest speed at which at least two of three are sharp is your realistic handheld limit. The difference in stops between the off and on limits is what your system truly gives you at that focal length. If a soft frame shows a streak in one direction, that is shake; if the corners are worse than the center, that is roll, so press the button more gently. Write the number down: it removes the guesswork the next time you shoot in low light.
Frequently asked questions
Should I leave image stabilization on all the time?
For handheld photography, yes. It rarely hurts at fast shutter speeds and it steadies the viewfinder. The main exceptions are tripod work with systems that do not detect tripods, and panning without a panning mode.
Does image stabilization drain the battery?
It uses some power, especially when it runs continuously in video or with an electronic viewfinder. The effect is modest for most photographers; carrying a spare battery is a better solution than turning stabilization off.
Do I need a stabilized lens if my camera has IBIS?
Not for wide and normal lenses, where sensor stabilization works well. For long telephoto lenses, a stabilized lens usually performs better, because the sensor cannot travel far enough, and combining both systems often gives the largest benefit.
Does stabilization help with astrophotography?
Not for ordinary long exposures on a tripod, which is the normal way to photograph the night sky, so turn it off there. Stabilization cancels hand tremor, not the slow turning of the sky. A few cameras can use their sensor-shift mechanism to follow the stars for short exposures, which is a separate feature; see astrophotography for the usual approach.
Why are my stabilized photos still blurry?
Check whether the blur is subject motion (background sharp, subject soft), missed focus (a different plane in focus), or shake beyond the stabilizer’s range (everything doubled in the same direction). Only the last one is a stabilization problem, and the fix is a faster shutter or better support.
Is electronic stabilization as good as optical?
Not for still photos. Electronic stabilization moves a crop between frames, so it smooths video but cannot remove blur inside one exposure, and it costs some field of view. Optical and sensor stabilization steady the image during the exposure itself.