What is the difference between shutter speed and shutter angle?

Question by Artisan: What is the difference between shutter speed and shutter angle?
I’ve tried to read up and research it, but I still can’t get a grasp on the difference. Angle is the actual size of the shutter “plate”, speed governs its rotation?
And, if you change the shutter speed, are you in turn changing the angle? Or can they both be changed independently?

Best answer:

Answer by Aladdine
shutter speed is the length of time a shutter is open; the total exposure is proportional to this exposure time, or duration of light reaching the film or image sensor.
On more advanced cameras the shape of the shutter can be adjusted. This shutter setting is referred to as the shutter angle.
Adjusting the shutter angle controls the proportion of time that the film is exposed to light during each frame interval. The angle of the shutter forms a proportion to the time that each frame of film is exposed.

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One Response to What is the difference between shutter speed and shutter angle?

  1. anthony h says:

    Shutter angle only applies to rotary type shutters; it does not apply to focal plane shutters used in a typical film SLR or digital SLR.

    Adjusting the shutter angle changes the shutter speed. A wider angle is equivalent to having a slow shutter speed because it creates a longer exposure. A narrow angle is like having a fast shutter speed, because the film is exposed only for a short time. Notice that the rotation can be constant–it doesn’t have to change speeds. Only the “slice of the pie” the angle controls the actual exposure time (shutter speed).

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