Time Lapse

Time Lapse

noun | Camera & Optics

A filmmaking technique in which individual frames are captured at intervals much longer than normal frame rates -- one frame per second, one frame per minute, one frame per hour, or slower -- and then played back at standard speed. When hours, days, or months of real-world change are compressed into seconds or minutes of playback, processes too slow for human perception become visible as dramatic, continuous motion. A sunrise becomes a rapid bloom of colour across the sky; a city street transforms from empty to packed to empty again in moments; a flower blooms, wilts, and dies in seconds.

Quick Reference

The Explanation: How & Why

Time lapse is the extreme end of undercranking -- the frame rate is reduced so far below the normal playback rate that the captured "frames per real second" drops below one. Rather than a film camera running continuously at 12fps, a time lapse captures a single frame every few seconds or every few minutes, triggered by an intervalometer (a programmable timer). When those frames are assembled and played back at 24fps, the compression ratio is enormous: 1440 frames captured at one-per-minute over a 24-hour day play back at 24fps in exactly 60 seconds.

The compression of time is time lapse's defining capability and its primary creative application. It makes the invisible visible. Cloud formations build and dissipate in seconds. Traffic patterns reveal themselves as flowing rivers of light. The construction of a building unfolds in minutes. The decay of organic matter becomes a rapid, almost violent transformation. Human-scale processes and geological-scale processes both become accessible to human perception when compressed by time lapse.

The technical requirements of time lapse differ from those of conventional cinematography:

Intervalometer: A programmable timer that triggers the shutter at preset intervals. Most cameras have built-in intervalometer functions; external triggers are used when greater precision or longer duration is needed. The interval between frames determines the compression ratio: shorter intervals (1 second between frames) produce lower compression suitable for relatively fast processes (clouds, traffic); longer intervals (1 minute or more) produce high compression for slow processes (construction, plant growth).

Exposure consistency: Over a long time lapse sequence, lighting conditions change significantly. A sequence spanning dawn to dusk must handle a range of 8 to 12 stops of changing exposure. Manual exposure settings will produce noticeable brightness jumps as light changes. Solutions include exposure ramping (gradually adjusting exposure as light changes, avoiding discrete jumps), magic lantern or dedicated time lapse firmware, or post-production deflicker processing.

Camera stability: A time lapse is typically captured from a fixed, locked-off position. Any movement of the camera between frames -- vibration from wind, accidental bumps -- creates a jump in the sequence. Heavy tripods, sandbags, and protected camera positions are essential for clean time lapse.

Motion control time lapse: A motorised head or slider can be programmed to move the camera slowly across the scene during a time lapse, producing a compound effect: the subject of the time lapse changes rapidly while the camera also moves, adding a cinematic dimension to the technique.

Historical Context & Origin

Time lapse photography predates cinema. French botanist and photographer Adhemar Bulard documented plant motion through sequential photography in the 1880s. German filmmaker and biologist Julius Oomkens developed the technique for scientific documentation of biological processes in the 1890s. The transition from scientific tool to artistic and narrative device came through the documentary tradition -- early city-symphony films of the 1920s and 1930s, including Dziga Vertov's Man with a Movie Camera (1929) and Walter Ruttmann's Berlin: Symphony of a Metropolis (1927), used time lapse to transform urban life into choreographic pattern. Nature documentary cinematography throughout the 20th century refined time lapse as the primary technique for depicting botanical, meteorological, and geological processes. David Attenborough's BBC natural history productions from the 1970s through the 2000s established time lapse nature photography as a distinct cinematographic discipline, with specialist practitioners working entirely in this mode.

How It's Used in Practice

Scenario 1 -- Documentary / Nature (DP): A documentary about an urban garden requires a sequence showing a plant growing from seedling to full flower over 6 weeks. The DP sets a locked-off camera on a dedicated intervalometer, capturing one frame every 15 minutes over the 6-week period. The resulting 4032 frames play back at 24fps in 168 seconds -- just under 3 minutes. The DP uses a motorised exposure ramp to handle the day-night exposure cycling across the 6-week period.

Scenario 2 -- Feature Film Establishing Shot (Director / DP): A film's opening sequence uses a 40-second time lapse of a city sky from dawn to dusk as an establishing shot for a story set across a single day. The DP captures the sequence over 12 hours from a rooftop, using an interval of 10 seconds between frames. 4320 frames are captured; at 24fps playback, they run 180 seconds. The DP selects the 40-second portion that best represents the day's arc of light.

Scenario 3 -- Motion Control Time Lapse (DP): For an architectural sequence, the DP combines a time lapse of passing clouds over a building with a slow camera pan. A motorised head is programmed to complete a 30-degree pan over 4 hours. Frames are captured every 5 seconds. In playback, the clouds race across the sky while the camera slowly reveals the full facade of the building -- the motion control movement is smooth despite happening over 4 real hours.

Usage Examples in Sentences

"Set the interval to 10 seconds for the cloud sequence -- that gives us good cloud motion without it looking like a hurricane."

"For the plant growth over 6 weeks, one frame every 15 minutes gives us enough for a 3-minute sequence at 24fps."

"The exposure ramp is essential for a dawn-to-dusk time lapse -- without it, every sunrise and sunset creates a flicker that the deflicker plug-in cannot fully clean."

"Motion control time lapse is the best of both worlds: the compression of time lapse with the spatial movement of a tracking shot."

Common Confusions & Misuse

Time Lapse vs. Undercranking: Both compress time by capturing fewer frames per second than the playback rate. Undercranking typically refers to frame rates between 1fps and 18fps -- still in the range of action photography, used for subtle to moderate acceleration of real-time motion. Time lapse refers to intervals of one second or longer between frames, compressing processes over minutes, hours, days, or longer. Undercranking makes a running person faster; time lapse makes a flower bloom in seconds.

Time Lapse vs. Hyperlapse: A hyperlapse is a time lapse in which the camera physically moves between frames -- typically by moving the camera position a short distance between each frame along a planned path, producing the appearance of the camera flying through the environment at very high speed. A standard time lapse has the camera in a fixed position. Both compress time, but a hyperlapse adds continuous spatial movement as an additional dimension.

Variations by Context

Related Terms

• Undercranking -- The in-camera technique that underlies time lapse; time lapse is its extreme slow-frame version
• Frame Rate -- Time lapse radically reduces the effective capture frame rate below normal values
• Overcranking -- The opposite technique; expands time rather than compressing it
• Slow Motion -- The perceptual opposite of time lapse; stretches rather than compresses time
• Static Shot -- Time lapse is almost always captured from a fixed, locked-off camera position

See Also / Tools

The Slow Motion Calculator calculates compression ratios and playback durations for time lapse sequences -- enter the capture interval and desired playback duration to determine how long you need to shoot. For productions scheduling long-duration time lapse capture alongside other production work, the Production Schedule Calculator helps plan the unattended capture periods.