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Re: Normal-to-Slow Motion Shutter Speed and Frame Playback Rate

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Richard Herd
Re: Normal-to-Slow Motion Shutter Speed and Frame Playback Rate
on Jan 10, 2015 at 12:01:50 am

Motion Shutter Speed is calculated as follows: Frame Rate * Shutter Angle. dSLRs do not have an option to control the shutter angle, the next step up in camera pricing allows the shutter angle to be controlled. If your camera does that, it might be called something else, like syncro scan.

In normal motion photography, regular sync sound at 24fps, with a 180-degree shutter angle, the shutter SPEED is 1/48. When shooting overcranked, say at 60fps, with a 180-degree shutter angle, the shutter speed is 1/120. Halving everything again, means the shutter angle of 90-degrees, at 60fps, gives you a shutter speed of 1/240. Check my math, but a 1/1000 shutter speed at 60fps is a shutter angle of 16-degrees. At those fast shutter speeds, you run the risk of creating funky-jerky-feeling footage. I call it "feeling" because, as an audience, we are used to seeing the motion blur of 1/48 and 1/240 shutter speeds.

You might try them all and vary the ISO as you go. See what happens, being sure to get your required shots, of course.


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