Photron Fastcam SA3, Руководство по оборудованию

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31 FASTCAM SA3 Hardware Manual
3.7.7. TWO STAGES Mode
TWO STAGES mode is a recording mode which can vary the frame rate during recording. For
example, while continuously recording a shot of a basketball player as shown below, unique
recording is possible such as recording the scene by raising the time resolution at only the instant of
the jump.
This section explains how recording in this mode works and how to use it.
TWO STAGES Mode Concept/External Control Signal Input
When using TWO STAGES mode, first decide on the frame rate with which to record at high-speed. The
low-speed portion of the recording frame rate can be set as a proportion, 1/2, 1/4, or 1/8of the high-speed
frame rate.
The timing for the frame rate switch is controlled externally by a TTL signal. Use the [GENERAL IN]
connector for the TTL signal input.
TWO STAGES Mode Operation Diagram
(Relationship between GENERAL IN input and the recorded frames) (when set to x1/4)
The trigger operation in TWO STAGES mode is START mode.
Control of the switching of the low-speed/high-speed frame rate is done by inputting a TTL signal to the
[GENERAL IN] connector. There is only one section of high-speed recording within the recording time.
GENERAL_IN Input"H" High-speed setting operation from next frame
GENERAL_IN Input "L" Low-speed setting operation from next frame
(When the polarity is positive)
Trigger
▼
GENERAL IN
REC Frame
○ ○ ● ● ● ● ● ● ● ● ● ○ ○
Frame No. 1 2 3 4 5 6 7 8 9 10 11 12 13