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Shutter angle
Shutter angle and speed, flicker-free settings, motion blur.
What it does
Turns a shutter angle into a shutter speed, and back, for a frame rate. 180° gives an exposure of half a frame: 1/50 s at 25 fps, 1/48 s at 24 fps. That’s the usual, natural-looking motion blur; a smaller angle gives sharper, choppier motion (action scenes), a larger one more blur.
- Closest camera speed: when your camera sets speeds rather than angles.
- Longer than a frame (1/2 s, 1 s at 25 fps): impossible, the camera must move on to the next frame; at most 1/25 s, 360°. Some cameras offer a “slow shutter” that shoots fewer frames and repeats them: long light trails, very choppy motion.
- Flicker: mains lighting pulses 100 times a second in Europe (50 Hz) and 120 in the Americas (60 Hz). An exposure lasting a whole number of pulses (1/50, 1/100 s in Europe; 1/60, 1/120 s in the Americas) avoids it. Many LED lights don’t flicker at all; others (and screens) pulse at their own rate: do a test shot. The last two lines list every flicker-free angle at your frame rate.
- The drawing: the rotating shutter of film cameras (the open part is the angle), and three fans turning 1.5 times a second, filmed at 360°, 180° and your angle, frame by frame at the chosen frame rate. The blur is computed like a sensor does: the fan is added up over the whole exposure time. A smaller angle: sharper spokes (and choppier motion in the video); a larger one: more blur (and smoother motion).
Free, no account, nothing is sent: it runs in your browser, even offline.
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