Photron Fastcam SA3, Hardware Manual

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Chapter. 3 Recording
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3.8. LOW LIGHT Mode
The more you increase the frame rate or shutter speed of the camera, the more the amount of light
entering the camera decreases, making the displayed image darker. Low light mode is a function that
temporarily increases the exposure time, making the displayed image easier to see to enable you to
focus and setup camera.
3.9. VARIABLE Setting
In the recording conditions settings, the frame rate and resolution can be set to the desired value
following the conditions listed below.

FRAMERATE can be set from 48 frame rates between 60 fps (50fps for PAL) and 120,000 fps.

The size and horizontal position of the resolution can be set in 128 (horizontal) and 16(vertical)
increments. And horizontal position can be set in 64 (horizontal) and 8(vertical)
increments.

The specifications of 60K type is 60,000fps