Lenses, Focus & Exposure · Film language

Shutter Speed

Also called: exposure time, shutter angle

Shutter speed is how long each frame is exposed to light, written as a fraction of a second or, on cine cameras, as a shutter angle. It sets two things at once: how bright the image is and how much blur a moving subject leaves, which decides whether motion looks smooth, smeared or sharply staccato.

Watch first: the whole guide in 1:33, hosted by Yaro

Video script

Somebody has to open this door, let the light in, and slam it. Every frame of every film. Twenty-four times a second. Today, me.

How long I hold it open is the shutter speed. One fiftieth of a second, say. Twice as long, twice the light.

Hold it long and everybody gets in. Bright, and whatever moves gets painted along its path. A fist becomes a streak.

Slam it quick: one sharp man, frozen, hardly any light. One door, two jobs.

Film cameras made my door a spinning half disc. One-eighty at twenty-four frames is one forty-eighth of a second. I asked for a seatbelt.

A century of that reads as neutral. Start at double your frame rate.

Go wide and I barely close. Chungking Express ran crowds through here in smears. I mopped for a week.

Go narrow and I slam like the door owes me money. Saving Private Ryan: sand hanging sharp, nervous, hyper-real. Also me.

Worst order: bright day, one thousandth, fix it. It fixes it. Now every pan stutters.

Leave my door alone. Draw the blinds: an ND filter does that for the lens.

A prompt has no door. One twenty-fifth alone often comes back clean. Say what streaks and what stays sharp: shoppers smear, stalls don't.

Right, my break. Back in one forty-eighth of a second. Break's over.

The rest is behind this door. Scroll down.

What it does: Controls exposure time per frame, and with it the length of the smear every movement leaves on the image.
Use it when: You choose how motion should feel: natural at 180°, frantic and crisp when narrow, dreamy and smeared when wide.
Watch out: Don't fix a bright day by raising shutter speed; use ND filters, or pans start to strobe and action looks choppy.
Try this prompt: night market, woman running past lantern stalls, slow shutter 1/25 s, her arms and passing shoppers smeared into streaks, stalls crisp

Shutter Speed in Titanic (1997) — Titanic (1997), dir. James Cameron, DP Russell Carpenter — a head crossing close to the lens smears into a dark shape while the faces behind it stay readable.

What is shutter speed?

Every frame is a short exposure: the shutter opens, light builds the image, the shutter closes. That span is the shutter speed, such as 1/50 s or 1/1000 s. Doubling the time doubles the light, so 1/100 to 1/50 is one stop brighter, like opening the aperture one stop.

It is one corner of the exposure triangle, and the only one that touches time. Anything moving while the shutter is open is recorded along its path: a longer exposure turns a swinging fist into a streak, a shorter one freezes it. In moving pictures the frame rate caps how long each exposure can last.

Shutter speed vs. shutter angle

Film cameras spin a half-disc in front of the gate: while the open part passes, the frame exposes; while the solid part passes, the film advances. The opening, in degrees, is the shutter angle.

Shutter speed = (angle ÷ 360) × (1 ÷ frame rate)

180° at 24 fps = 1/48 s
90° at 24 fps = 1/96 s
45° at 24 fps = 1/192 s
360° at 24 fps = 1/24 s, the longest a frame allows

Change the frame rate from 24 to 48 fps at 180° and the blur stays proportional while the speed becomes 1/96. The 180-degree shutter rule is the middle setting both systems agree on.

Why filmmakers change shutter speed

A century of films shot near 180° made that amount of blur read as neutral. Move away from it and viewers feel the difference before they can name it.

Narrow shutter (90° to 45°). Each frame is crisp but the gaps between frames grow, so fast action jitters. Janusz Kamiński narrowed the shutter for the Omaha Beach landing in Saving Private Ryan (1998); sand and debris hang sharp in every frame and the violence feels nervous and hyper-real.

Wide shutter or slow speeds. Movement smears and trails: drunkenness, panic, memory. Chungking Express (1994) combined low frame rates, slow shutters and step-printing so crowds rush past in smears.

The blur itself has its own page, motion blur; shutter speed sets its length.

What shutter speed should you use for video?

Start at double the frame rate, then break it on purpose.

24 fps: 1/48 or 1/50 s (180°)
30 fps: 1/60 s
60 fps: 1/120 s
120 fps for slow motion: 1/240 or 1/250 s

Control daylight with ND, not shutter. Raising the shutter to 1/1000 s fixes a sunny exposure but makes every pan stutter. Neutral density lens filters keep the shutter where motion looks right.

Match the mains frequency. LEDs, fluorescents and screens pulse with the grid. On 50 Hz power use 1/50 or 1/100 s; on 60 Hz at 24 fps, set 144° (1/60 s).

More exposure tools are in the lenses, focus and exposure hub.

How shutter speed and motion blur work together

Blur depends on how far an image travels across the frame during one exposure, not on real-world speed:

Subject speed. A head snap travels farther than a walking extra.
Camera movement. In a pan the background sweeps across the sensor and smears, while a subject you follow can stay sharp.
Distance and focal length. Someone passing close to a wide lens streaks; the same walk on the horizon barely moves.

Picture the fastest thing in the shot and decide how long its trail should be.

Shutter Speed in motion

9 clips

Blur exists only while something moves, so watch the fastest thing in each clip: a whip of the camera, a fist, a spinning page. Then find what stays sharp beside it; that contrast is the shutter at work.

Blackhat (2015), dir. Michael Mann, DP Stuart Dryburgh — a handheld camera backs away ahead of a man sprinting down an alley, then whips around a corner with him. Walls and painted characters streak sideways; his face sharpens only when the camera matches his speed.

Chungking Express (1994), dir. Wong Kar-wai, DP Christopher Doyle, Andrew Lau — a young cop in a pale jacket shoves through a packed arcade. Faces, shoulders, a blonde wig and neon smear into trails, then he sprints past shuttered stalls in a haze of streaks.

Ip Man (2008), dir. Wilson Yip, DP O Sing-Pui — the camera whips across a brawl among cotton bales. On every whip the whole room turns into horizontal smears; when it settles on Ip Man in his guard, his hands and face read clearly again.

Crouching Tiger, Hidden Dragon (2000), dir. Ang Lee, DP Peter Pau — in close-up a young woman in white parries a staff and a blade; weapons and her snapping head smear. Cut wide to the duel among carved chairs, where only the swings blur.

Titanic (1997), dir. James Cameron, DP Russell Carpenter — steerage passengers crush against a locked gate. Inside the scrum, heads crossing close to the handheld lens smear into dark shapes and a raised club blurs, while faces a step behind stay readable.

Throw Down (2004), dir. Johnnie To, DP Cheng Siu-keung — shuffling feet, then a man in a blue jacket under neon jerks his arms and head. Each quick move leaves a ghost, while the lit signs behind him stay crisp and legible.

Operation Chromite (2016), dir. Lee Jae-han, DP Park Jang-hyuk — a brawl in quick cuts: fists and faces stretch into streaks mid-punch, a man vaults a truck and tumbles through dust, then a young woman's scream lands sharp because she barely moves.

Murder in the First (1995), dir. Marc Rocco, DP Fred Murphy — an aerial camera skims over treetops toward a dirt yard where a white convertible rolls in. Branches passing close to the lens smear into green streaks; the car far below stays readable.

Back to the Future Part II (1989), dir. Robert Zemeckis, DP Dean Cundey — front pages spin on a TV screen. While a page turns it is an unreadable smear; once it stops, "Biff Wins Again" is sharp, and the set around it never blurs.

Shutter Speed stills

8 frames

Look for where each frame streaks and what stays sharp beside it.

Shutter Speed in Ip Man (2008) — Ip Man (2008), dir. Wilson Yip, DP O Sing-Pui — the whole room streaks sideways and the running figure dissolves into it.

Shutter Speed in Operation Chromite (2016) — Operation Chromite (2016), dir. Lee Jae-han, DP Park Jang-hyuk — fist and face stretch into streaks, each as long as its path during one exposure.

Shutter Speed in Battles Without Honor and Humanity (1973) — Battles Without Honor and Humanity (1973), dir. Kinji Fukasaku, DP Sadaji Yoshida — a street crowd smeared on film, one face near the middle holding its shape.

Shutter Speed in Crouching Tiger, Hidden Dragon (2000) — Crouching Tiger, Hidden Dragon (2000), dir. Ang Lee, DP Peter Pau — a head snaps away from a blow and its features double; the dark wall stays sharp.

Shutter Speed in Throw Down (2004) — Throw Down (2004), dir. Johnnie To, DP Cheng Siu-keung — under neon, face and hands blur with the movement while the signs behind stay legible.

Shutter Speed in Transformers: Age of Extinction (2014) — Transformers: Age of Extinction (2014), dir. Michael Bay, DP Amir Mokri — the running man's profile smears; the market stalls around him keep their detail.

Shutter Speed in Blackhat (2015) — Blackhat (2015), dir. Michael Mann, DP Stuart Dryburgh — wall, doorway and man streak together: the camera moved during the exposure.

How to create a shutter speed with AI

4 prompts

Image models read what blur looks like, not fractions of a second. Name the shutter, then say which parts streak and which stay crisp. Build a slow-shutter start frame in Nano Banana 2 Lite, a frozen narrow-shutter take in GPT Image 2.5, and animate recipe 1 with MiniMax H3 Max Turbo, all beside your film references on one FlashBoards board. The fourth prompt re-shoots a real film shot from a text description alone, and the original plays next to the result so you can compare.

Text → ImageNano Banana 2 Lite

Cinematic medium shot at night in a crowded street-food market, slow shutter 1/25 s, 35mm lens at chest height. A courier in her thirties with cropped silver-dyed hair, a thin scar through her left eyebrow and a yellow rain jacket runs toward camera; her swinging arms and the shoppers crossing in front of her smear into soft horizontal streaks. The stalls with red paper lanterns behind her stay sharp. Warm tungsten light, wet pavement, film grain.

shutter speed generated with Nano Banana 2 Lite — Generated in FlashBoards with Nano Banana 2 Lite · unedited

Smear into soft horizontal streaks on the moving parts and stay sharp on the stalls do the work: that contrast reads as a slow shutter rather than a soft image.

Open FlashBoards

Text → ImageGPT Image 2.5

Widescreen close-up in a dim boxing gym, narrow 45-degree shutter, 1/500 s, 50mm lens. A boxer in his forties with a shaved head, gray stubble, a crooked nose and faded blue hand wraps lands a punch on a heavy bag; sweat droplets flying off his brow are frozen as sharp separate beads, chalk dust hangs crisp in one hard beam of window light. High contrast, gritty grain.

shutter speed generated with GPT Image 2.5 — Generated in FlashBoards with GPT Image 2.5 · unedited

The other end of the dial. Frozen as sharp separate beads describes what a narrow shutter does to fast motion; the hard beam makes the particles visible.

Open FlashBoards

Image → VideoMiniMax H3 Max Turbo

Camera: handheld, backing away at her running pace for the whole shot, keeping her centered at chest height. Action: from the first frame she is already running toward camera, arms swinging, shoppers crossing in front of her in blurred streaks. In the middle she weaves between two shoppers. At the end she slows to a stop, breathing hard, and looks back over her shoulder; her face turns sharp while shoppers keep streaking past.

Input image: first frame from prompt 1 — First frame · the image from prompt 1

Image → Video · generated in FlashBoards with MiniMax H3 Max Turbo · unedited, with sound

Motion starts in the first line, so the clip doesn't open on a frozen still; her stopping while the crowd keeps moving shows that blur follows movement.

Open FlashBoards

Text → VideoMiniMax H3 Max Turbo

{
 "output": "Full-screen live-action shot from Blackhat (2015) from its very first frame: one continuous, violently shaky handheld shot, no cuts, filmed by a camera operator sprinting backward with the camera on his shoulder — the picture never holds still for a single moment. Overcast daylight in a maze of narrow back alleys and stacked shipping containers, flat, soft gray-green light, desaturated teal and rust palette, 2010s digital cinema texture. Slow, wide-open shutter: every jolt and swing of the camera smears walls, painted characters and container sides into long streaks, and the runner turns sharp only in the moments the camera matches his speed.",
 "characters": {
  "S1": {
   "name": "Alex Trang, played by Andy On Chi-Kit",
   "look": "lean, muscular man in his thirties, short spiky black hair, black sleeveless shirt, a white ID card on a lanyard at his chest, dark trousers with a black belt, a wristwatch on his left wrist, a black pistol held low in his right hand",
   "voice": "heavy running breaths only"
  }
 },
 "shots": [
  {
   "shot": 1,
   "camera": "[Shake] [Pull out] [Pan right] rough handheld on the shoulder of an operator running backward ahead of S1 at chest height, wide lens, unstabilized: the whole frame bounces up and down with every one of the operator's strides, about three hard jolts a second; the horizon rolls several degrees left and right and never settles level; the framing lurches sideways and lags behind S1, losing him toward the frame edge and snapping back; each jolt blurs the entire image. Midway the camera swings hard to the right to follow him around a corner, then backs away again. Starts as a wide shot down a deep alley, ends in a close medium shot with his torso filling the left half of the frame.",
   "action": [
    "BEGINNING: alive from the first frame, S1 is already sprinting toward camera from the far end of a dim, narrow alley, small in the center of the frame, a second running figure in dark clothes far behind him; a ridged corrugated-metal wall on the right and a dark wall on the left rush past the lens as soft vertical smears.",
    "THEN: [Shake] he closes to a medium shot, arms pumping, the pistol pointed at the ground in his right hand on the left of frame; the frame jerks up and down with each of the operator's steps and tilts left, then right, the whole image blurring on every jolt.",
    "THEN: the camera swings right, and a pale corrugated wall painted with tall red Chinese characters slides behind him as red horizontal streaks; for a moment his face is sharp, jaw set, eyes fixed straight ahead past the lens, mouth open for breath.",
    "THEN: a pursuer in a black shirt bursts into the background on the left, running after him, blurred.",
    "THEN: S1 runs right past the lens on the right side of frame, his shoulder, bare arm and watch smearing across it, and the camera whips right around with him.",
    "THEN: in a brief close-up his head turns to look back over his right shoulder toward the left of frame, face crisp, while the white wall of notices behind him streaks sideways.",
    "THEN: [Shake] [Pull out] the shaking camera is backing away again, bouncing hard with each stride, down a narrow passage between shipping containers; S1 runs toward it from mid-distance, two pursuers in dark clothes close behind him on the left; a teal container on the left with huge white painted characters streaks into pale bands, a pale corrugated wall on the right.",
    "END: the frame still bouncing and tilting, a rust-brown container on the left and a blue container with big white characters on the right; S1 bears down on the lens, left arm pumping, pistol low in his right hand, until his black shirt and ID card fill the left half of the frame and the white characters on the blue container smear across the right half."
   ],
   "voice": "silence: nobody speaks in this shot, no voice at all",
   "dialogue": []
  }
 ],
 "sound": {
  "ambience": "running footsteps slapping concrete, heavy breathing, clothes and the lanyard flapping, a shoulder brushing corrugated metal, distant city traffic heard from outside",
  "speech": "no words in this video; the only human sounds are breaths and movement",
  "never_spoken": "no narration and no voice-over: the descriptions, performance notes and step words of this prompt are never spoken aloud",
  "music": "a film score under the scene, always below the voices: a driving low electronic pulse with tense synth drones, a modern chase cue",
  "subtitles": "none"
 }
}

Text → Video · recreation generated in FlashBoards with MiniMax H3 Max Turbo from the prompt above · unedited, with sound

Original

The shot it recreates · Blackhat (2015)

Remakes the alley chase from Blackhat (2015): the prompt carries over the handheld camera backing away, its swing around the corner, the painted characters streaking behind the runner and the silent take under a chase score.

The JSON keeps it one handheld take and writes the shutter into the look: a slow, wide-open shutter that smears walls and painted characters on every swing, while the runner sharpens only when the camera matches his speed. The [Shake] and [Pull out] tags are MiniMax camera commands: they push H3 toward a rougher, unstabilized frame, though the model still steadies the picture more than the operator in the original did.

Open FlashBoards

Common mistakes

Numbers ignored. "1/25 s" alone often gives a clean image; say what streaks and what stays sharp.
Everything blurred. Anchor sharpness on something static: stalls, walls, signs.
Wrong blur direction. Write horizontal streaks for sideways movement, or you may get radial zoom blur.
Frozen looks rendered. Add grain, hard light and a real lens length.

FlashBoardsDirect the shutter speed on one board

Keep the reference frames, prompts and every generated take side by side — images and video in one canvas.

Open FlashBoards

FAQ

4 questions

What is shutter speed in simple terms?

Shutter speed is how long the camera exposes each image, such as 1/50 or 1/1000 of a second. A longer exposure lets in more light and blurs moving things; a shorter one darkens the image and freezes motion. In video it is usually set to about double the frame rate.

What is the best shutter speed for video?

For a natural cinematic look, use about double your frame rate: 1/50 s at 24 or 25 fps, 1/60 s at 30 fps, 1/120 s at 60 fps. Go faster for crisp, jittery action and slower for dreamy smears, and control bright light with ND filters instead of the shutter.

What is the difference between shutter speed and shutter angle?

Shutter speed is an absolute time, like 1/48 s. Shutter angle is the share of each frame interval the shutter stays open: 180 degrees means half. At 24 fps, 180 degrees equals 1/48 s. Cinematographers prefer angles because the look holds when the frame rate changes.

How does shutter speed affect motion blur?

The longer the shutter stays open, the farther a moving subject travels during one exposure and the longer its smear. At 1/25 s a waving hand becomes a streak; at 1/500 s it freezes. Camera moves count too: a fast pan smears the background even when the subject is still.

6

Further reading

American Cinematographer Manual (ASC Press) — shutter angle, exposure and frame-rate tables. Blain Brown, Cinematography: Theory and Practice (Routledge) — chapters on exposure and camera shutters.