ImageReasonMotion, Video, and Time-lapse
How big is each exposure step across my changing-light time lapse?
Enter your start and end settings, duration, and interval to see the total stop change and the per-frame step size your transition actually requires.
Answer
Calculate a result to see what else can introduce visible variation.
Want to learn more? Motion, Video Exposure, Panoramas, and Time-Lapse
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Calculate to see the EV line and frame count.
| Interval | Frames | Stops/frame |
|---|
Calculate a result to generate a copyable plan.
A declared transition, not a smooth guarantee
A changing-light time lapse needs a declared exposure transition, not merely a start and end setting. Dividing the EV change across frames makes the step size visible, but it does not make the camera or the scene smooth. Aperture steps, ISO processing, shutter timing, flicker, and automation can all show up in the final sequence.
A 30-minute transition at a five-second interval contains 361 frames. A three-stop EV change spread evenly across those frames is about .0083 stops each interval. That sounds small, but the camera may only offer discrete controls or add its own processing. Test a short sequence in similar light, choose which control is allowed to move, and review the result before relying on a long capture.
This is a planning calculation, not a certification. Confirm the relevant camera, lens, card, printer, contract, location, or workflow constraint in the real setup before relying on the result.
Make one controlled test with the important variable held constant. Inspect the subject detail, motion, highlights, and intended output, then adjust the setting that protects the priority you named.
FAQ
- Will small per-frame changes prevent time-lapse flicker?
- No. The arithmetic only describes your intended change. Camera steps, aperture behaviour, lighting, and processing can still produce visible variation.
- Is this a guarantee?
- No. The result is bounded by the inputs and assumptions shown on the page. It is designed to support a better next decision, not replace a test, measurement, proof, or professional judgement where one is needed.