Photron FASTCAM SA-Z, Hardware Manual

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Chapter. 3 Recording
3.3. Selecting the Resolution
The maximum resolution of the image sensor is 1,024 x 1,024: total 1,048,576 pixels. By reducing
the resolution, images can be taken with even faster frame rates, or the recording duration can be
extended accordingly.
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For more information of relation between Frame Rate and Resolution, refer to “5.1.4. Frame Rate
and Resolution”, page 84.
3.4. Selecting the 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 photographed blur-free.
The longest setting values of the shutter speed are as following:
- Frame rate is lower than 1,000 fps: 1/1,000 sec (1 msec)
- Frame rate is 1,000 fps or higher: one step shorter shutter speed setting than '1/frame' second.
(Please refer to the following Supplement part for the example)
The shortest setting value of shutter speed is 1/996,932 sec (approx 1.003 usec).
When “Uncertain Interval Extension” is enabled, it is shown 1/472,992 second (about 2.11usec),
and the EXPOSURE (POS / NEG) signals are output on this timing.
(Please refer to the following Important part for the details)
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For example, when working under 500fps, the available shutter speed varies from 1/1,000 to
1/996,923 second.
When working under 2000fps, a shutter speed varying from one faster step than 1/2,000 second,
1/2,020 second, to 1/996,923 second can be obtained.
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The numerical value of [0.xxx S] display serves as actual exposure time.
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The numerical value of [1/xxx S] display is round figure. It differs from actual exposure time a little.
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For more information of Shutter Speed, refer to “5.1.5. Shutter Speed List (uncertain interval
extension: Disable.)”, page 82 and “5.1.6. Shutter Speed List (uncertain interval extension:
Enable.)” page 83.
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