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来源：百度知道 编辑：UC知道 时间：2024/06/01 15:39:41
On cameras equipped with a variable shutter,the shutter angle can be narrowed to change shutter speed. Some bariable shutters may be shut dowm continuously, while others can only be shut down to certain angles.
Narrowing the angle reduces shutter speed. A 90'shutter ,for example ,gives a shutter spee of about1/100 at 24FPS (using the above formula for shutter speed).Closing the shutter reduces the exposure, allowing high-speed film to be used outdoors or allowing the lens to be opened to decrease depth of field or shooting at a selected f-stop.
A variable shutter that can be closed down while the camera is running allows exposure changes in the middle of a shot .For example,when the camera moves from a sunlit to a shaded area within a shot ,it is often necessary to change exposure. The iris diaphragm of the lens can be changed,but this would change the depth of field and may be more noticeable than shutting down the variable shutter .If the varia
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The Variable Shutter
On cameras equipped with a variable shutter,the shutter angle can be narrowed to change shutter speed. Some bariable shutters may be shut dowm continuously, while others can only be shut down to certain angles.
可变的快门
在相机上装有可变快门，快门角度可以弄窄以改变快门速度。一些可变快门可以任意角度的关闭，但其他的只能在某一定角度关闭。
Narrowing the angle reduces shutter speed. A 90'shutter ,for example ,gives a shutter spee of about1/100 at 24FPS (using the above formula for shutter speed).Closing the shutter reduces the exposure, allowing high-speed film to be used outdoors or allowing the lens to be opened to decrease depth of field or shooting at a selected f-stop.
把角度变小会把快门的速度减慢。一个90度的快门，例如，速度会达到大约1/100 ，在24贞的速度下，（利用上面提到的快门速度公式）。关掉快门会减少曝光，这样可以用与户外高速摄影或用于打开镜头减少景深或用于有选择的设(f-stop??).
A variable shutter that can be closed down while the camera is running allows exposure changes in the middle of a shot .For example,when the camera moves from a sunli