The hand-holding rule, also called the reciprocal rule or the 1/focal length rule, says that to get a sharp handheld photo your shutter speed should be at least 1 divided by the focal length of the lens. At 50mm, use 1/50 second or faster. At 200mm, use 1/200 or faster. At 24mm, 1/25 or faster. It is a starting point for avoiding camera shake, not a guarantee, and it needs adjusting for crop sensors, high resolution sensors and image stabilization.
Why longer lenses need faster shutter speeds
Your hands are never perfectly still. The tiny tremor is the same whatever lens you hold, but its effect on the picture is not. A longer lens shows a narrower slice of the scene, so the same small wobble moves the image a larger distance across the sensor. At 400mm a twitch that would be invisible at 20mm smears every edge. The shutter therefore has to be open for a shorter time to finish the exposure before the image moves enough to see. Tying the shutter speed to the focal length keeps the blur from shake roughly the same size in the final picture, whatever the lens.
The name “reciprocal” comes from the arithmetic: the shutter speed is the reciprocal of the focal length. The rule dates from 35mm film, when sharpness was judged on modest-size prints, and it was the main defense against shake for decades.
Want to test the rule without a camera? The camera simulator shows shake appear as you slow the shutter handheld, at any focal length, with and without stabilization.
Hand-holding rule chart for full frame and crop sensors
The rule was set for full frame (35mm) cameras. On a smaller sensor the same lens gives a narrower view, so shake is magnified more. Multiply the focal length by the crop factor first, then apply the rule. A 50mm lens on an APS-C camera with a 1.5x crop behaves like 75mm, so use 1/80 instead of 1/50. Cameras with a 1.6x crop need very slightly more, and a 2x Micro Four Thirds sensor doubles the speed. The chart rounds each result to the next standard shutter speed at or above the calculated value.
| Lens focal length | Full frame (1x) | APS-C (1.5x) | Micro Four Thirds (2x) |
|---|---|---|---|
| 16mm | 1/20 | 1/25 | 1/40 |
| 24mm | 1/25 | 1/40 | 1/50 |
| 35mm | 1/40 | 1/60 | 1/80 |
| 50mm | 1/50 | 1/80 | 1/100 |
| 85mm | 1/100 | 1/160 | 1/200 |
| 100mm | 1/100 | 1/160 | 1/200 |
| 200mm | 1/200 | 1/320 | 1/400 |
| 300mm | 1/320 | 1/500 | 1/640 |
| 400mm | 1/400 | 1/640 | 1/800 |
With a zoom, use the focal length you are actually shooting at, not the widest or longest the lens can reach.
High resolution sensors: why you may need to double it
The rule was calibrated for film and ordinary print sizes. A modern high resolution sensor packs pixels so tightly that a shift too small to notice on an older camera now spreads across several pixels. Viewed small, the picture still looks sharp. Viewed at 100 percent, or printed large, the softness shows. Smaller pixel pitch means less tolerance for movement.
A common adjustment on very high resolution bodies is to double the rule: 1 divided by twice the focal length. At 100mm that means 1/200 instead of 1/100. Whether you need it depends on how you use the pictures. For phone screens and social media the plain rule is usually enough. For large prints, cropping, or pixel peeping, add a stop.
How image stabilization changes the rule
Image stabilization measures the camera’s movement and shifts the sensor (IBIS) or a lens element (optical image stabilization) to cancel it. Its effect is rated in stops. Each stop halves the shutter speed you can hold. Starting from the rule’s 1/200 for a 200mm lens on full frame:
| Stabilization | Slowest speed in theory at 200mm |
|---|---|
| None | 1/200 |
| 2 stops | 1/50 |
| 3 stops | 1/25 |
| 4 stops | about 1/13 |
| 5 stops | about 1/6 |
| 6 stops | about 1/3 |
Treat those figures as best case. Stop ratings are measured under test conditions, and real results depend on your technique, your breathing and how long the exposure is. Many photographers count on about half the rated benefit until they have tested their own hands. Stabilization has two firm limits:
- It does not freeze the subject. It cancels your movement, not theirs. A walking person, a child or a bird still blurs at 1/15 however good the stabilization. See freezing motion for the speeds moving subjects need.
- It cannot replace a tripod for long exposures. Past a second or so, almost nobody holds still enough. Use a support from choosing a tripod.
Holding the camera to beat the rule
Good technique can buy a stop or more beyond the rule, and poor technique can cost as much.
- Hold the camera with your left hand under the lens and your elbows tucked against your body. How to hold your camera shows the grip.
- Use the viewfinder against your face if the camera has one. A camera held out at arm’s length to see the screen is much harder to keep still.
- Breathe out slowly and press the shutter gently at the bottom of the breath. Roll your finger onto the button; do not stab it.
- Lean against a wall, tree or post, or rest the camera on a railing or bag.
- Use burst mode at slow speeds. In a short burst, at least one frame often lands between tremors, and the first frame is often the softest because pressing the button moves the camera.
Getting soft pictures even at fast shutter speeds? How to take sharp photos sorts out shake, missed focus and subject motion one cause at a time.
Setting the camera so it follows the rule for you
Many cameras let you set a minimum shutter speed for auto ISO. Some offer an automatic option that ties the minimum to the focal length in use, often with a setting to make it faster or slower than 1/focal length. In aperture priority this keeps the shutter at or above the rule and raises ISO when the light drops, which is usually a better trade than a shaken picture. A little more noise can be cleaned up; motion blur from shake cannot.
Common mistakes with the hand-holding rule
- Forgetting the crop factor. 1/50 is right for 50mm on full frame and too slow on APS-C or Micro Four Thirds.
- Using the rule for moving subjects. It only covers your own shake. Subject motion sets its own, usually faster, speed.
- Trusting the back screen at full view. Slight shake is invisible on a small screen. Zoom to 100 percent before deciding a frame is sharp.
- Believing the stabilization rating. Five stops on the box is rarely five stops in your hands every time.
- Blaming shake for missed focus. If one part of the picture is sharp and another is not, it is focus or motion blur, not shake. Shake blurs everything in the frame in the same direction.
Try this: find your own limit
Pick a still subject with fine detail, such as text on a sign, and stand a few paces back. Set shutter priority at the focal length you use most. Take three frames at the rule’s speed, then three each at one, two and three stops slower, with stabilization off. Repeat with it on. At home, view every frame at 100 percent and note the slowest speed where at least two of three are sharp. That number, not the rule, is your personal limit for that lens.
Questions people ask
What is the 1/focal length rule?
It is another name for the hand-holding rule: the slowest shutter speed for a sharp handheld shot is 1 divided by the focal length. A 100mm lens needs 1/100 second or faster on a full frame camera.
Is the reciprocal rule the same as the hand-holding rule?
Yes. Reciprocal rule, hand-holding rule and 1/focal length rule are three names for the same guideline. “Reciprocal” refers to the shutter speed being the reciprocal of the focal length.
Does the rule apply to crop sensor cameras?
Yes, but use the equivalent focal length. Multiply by the crop factor first: a 50mm lens on a 1.5x camera needs about 1/80, and on a 2x camera 1/100.
Do I still need the rule with image stabilization?
Use it as the starting point, then go slower by part of the stabilization’s rating and check the results at 100 percent. For moving subjects the rule and the stabilization both matter less than the speed needed to freeze the motion.
What is the slowest shutter speed I can hand-hold?
Without stabilization, most people manage about 1/focal length, and steady hands with good technique can go a stop slower. With good stabilization at a wide angle, a careful photographer can often get some sharp frames at a quarter or half a second, but expect to take several.