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Why shutter angle is way better than shutter speed when shooting video

Jun 28, 2019 by John Aldred Add Comment

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Although “shutter angle” is mostly a digital concept these days rather than a physical thing, it’s the term that determines how the camera calculates your shutter speed when shooting video. It’s a foreign concept to many photographers, though, especially if they haven’t used cameras which utilise it. This video from DPReview explains why it’s the best way to control your shutter when shooting video.

Whether you use shutter speed or shutter angle, they both adjust your shutter speed, so what’s the big deal?

Well, with stills photography, you’re only making a single image at a time, or shooting bursts that stand alone as a series of single images. The shutter speed here is used either creatively, to freeze motion or capture some motion blur, or it’s used as an exposure tool when you’ve hit the extremes of your ISO and you don’t want to change the depth of field in your shot.

With video, it’s a little different, because each frame isn’t supposed to stand up on its own. It’s one of many images that are created and played back at many multiple frames per second. With the high-speed recording features of many cameras these days, that capture framerate could be as high as a thousand frames per second, but more realistically, it’s often around 120 frames per second like the Blackmagic Pocket Cinema Camera 4K or 180 frames per second like the Panasonic GH5.

If your shutter speed is too slow, the video can look almost dreamy, and if this is the effect you’re going for, then that’s great, but if not then it just hinders the viewer. Likewise, if the shutter speed is too fast, it’s like you’re filming a Jason Bourne movie as each frame stutters to the next.

The formula for figuring out the ideal shutter speed for most scenarios is called the 180° shutter rule. The reason why it’s called this is largely historical, but these days it essentially means that you’re shooting at a shutter speed of 1/(2xFPS). So, if you’re shooting at 24fps, your ideal shutter speed would be 1/48th of a second. If you’re shooting at 120fps, then it would be 1/240th of a second.

Many cameras that aren’t specifically video oriented don’t offer these framerates, so you have to round off to the nearest available. So, for 24fps, 1/50th, for 60fps, 1/125th and 120fps at 1/250th. If you’re regularly switching framerates, though, remembering to adjust this shutter speed between shots isn’t always easy, especially in a run & gun situation.

Cameras that are geared more towards video offer the shutter speed as a shutter angle setting. This way, as you change your framerate to go between realtime and high-speed recording, your shutter speed automatically switches to what’s required to keep a consistent level of motion, regardless of the framerate you’re shooting at.

Having the shutter angle means that if you also want to shoot at a shutter speed other than 180°, you can dial in the new relative exposure and as you change your framerate, the camera automatically adjusts the shutter speed to keep a consistent look. Perhaps you want a 360° shutter where the shutter is open for the entire duration of each frame. Or maybe you want to go with a 90° or 45° shutter to get that stuttery Bourne look.

No matter what angle you set, the shutter angle setting allows the camera to keep consistency as you bounce between different framerates without having to figure out what the shutter speed should be in your head. Then when it’s all played back at 23.976fps, or whatever the final framerate of your film is, it all matches.

[via DPReview]

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Related posts:

Canon’s new global shutter CMOS sensor will eliminate rolling shutter issues for video Everything you ever needed to know about shutter speed Shutter Speed Chart as a Photographer’s Cheat Sheet Making sense of aperture, shutter speed and ISO with the exposure triangle

Filed Under: Tutorials Tagged With: DPReview, Shutter Angle, shutter speed, tutorial

John Aldred: from diyphotography.net

About John Aldred

John Aldred is a photographer with over 20 years of experience in the portrait and commercial worlds. He is based in Scotland and has been an early adopter - and occasional beta tester - of almost every digital imaging technology in that time. As well as his creative visual work, John uses 3D printing, electronics and programming to create his own photography and filmmaking tools and consults for a number of brands across the industry.

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