Photron FASTCAM MH6, Hardware Manual

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FASTCAM MH6
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Selecting Shutter Speed
The shutter speed (Exposure time) is independent of the frame rate, and it is possible to
control the exposure time in the frame using the electric shutter. By making an exposure
that is of a shorter period than the frame rate, high-speed objects can be shot without blur.
When the frame rate is lower than 1,000 fps, the shutter speed can be changed from
1/1,000 (1msec), and when the frame rate is 1,000 fps or higher, it can be changed from
one step shorter shutter speed than '1/frame' second to maximum 1/4,800,000 second
(0.2usec) (it depends on the setting).
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For more information of Shutter Speed, refer to “3.1.4. Shutter Speed List”, page 23.