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Shutter Angle/Shutter Speed


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#1 sergio cassini

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Posted 09 March 2007 - 01:30 PM

on the varicam you can set shutter angles or speeds.can somebody please explain the corelation between shutter angle on a film camera and shutter speed on a video camera.is for example a shutter angle of 180 the equivalent to the shutter speed of 1/60 sec?if so is there a rule or a table available?thank you
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#2 Michael Nash

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Posted 09 March 2007 - 06:47 PM

It's pretty straight forward. Film cameras use a rotating disc with a wedge-shaped opening for the shutter. The angle of the wedge (shutter angle) determines the shutterspeed. The "normal" shutter angle is 180 degrees (half the circle or disc), giving you a shutterspeed of 1/48 second at 24fps.

It's a direct relationship: cut the shutter angle in half, and you cut the shutter speed in half. A 90 degree shutter at 24fps gives you a shutter speed of 1/96 second.

Keep in mind that when you change the frame rate and keep the shutter angle constant, the shutter speed will change accordingly. In other words, at 12fps a 180 degree shutter gives you a shutter speed of 1/24 second; 60fps & 180 gives you 1/120 second.
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#3 sergio cassini

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Posted 10 March 2007 - 03:45 AM

thank you michael,i come from the video side but i get it now.cheers,s.
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