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Shutter angle/shutter speed/aperature


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#1 jon lawrence

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Posted 26 October 2006 - 06:12 PM

Hi, I was curious about the relationship between shutter angle, shutter speed and aperature. I read that shutter speed is used to control the amount of motion blur e.g a small shutter angle would restrict the amount of motion blur which is used to give a stuttered feel. If so, would that mean I'd need a larger aperature to compensate for the loss of light reaching the film? I'm confused to weather shutter speed and shutter angle are, in some respects, the same thing.

Any help would be much appreciated.
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#2 Bernhard Zitz

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Posted 27 October 2006 - 09:32 AM

The shutter is usually a spinning round plate with a cut-out (exept beaulieus have a guiotine shutter). A normal shutter has a 180 degrees cut-out. This looks like the half of a apple-pie. If you shoot at 25fps you get a shutterspeed of 1/50. If your shutterangle is 90degrees (looks like a apple-pie where 1/4 has been eaten) you get 1/100 shutterspeed at 25fps, ect..

shutterspeed=1/((360/shutterangle) * fps)

since your shutterspeed (eposing-time) changes you have to compensate in f-stops
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#3 Anthony Schilling

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Posted 27 October 2006 - 12:10 PM

I use a faster shutter a lot for variuus reasons... opening one full stop for a 90 degree shutter, and 2 stops for a 45 degree shutter. It works for me everytime.
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