Photron FASTCAM ultima APX-i2, Hardware Manual

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FASTCAM-ultima APX-i2 Hardware Manual
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4.5.9. DUAL FRAMING RATE Mode
The DUAL FRAMING RATE Mode has been devised to use two preset framing rates
alternately. It allows for changing the framing rate during a recording to capture faster
or more interesting events for slower playback. For example, while shooting, at a
slower framing rate, a basketball player nearing the goal, you can record the instance
the basketball player stuffing the ball into the basket in a higher temporal resolution for
subsequent motion analysis. This section describes how the Dual Framing Rate Mode
works.
Concept of Dual Framing Rate Mode and External Control Signal Input
To use the Dual Frame Rate mode, you first set a higher framing rate with which you
wish to capture the instance of important event. Then, you set a slower framing rate as
1/2, 1/4 or 1/8 of the higher framing rate.
The change of the frame rate during recording is effected by an external TTL signal
input using the GENERAL IN cable connector.
The following figure is a visual presentation of the temporal relationship between the
trigger signals and corresponding recorded to be recorded in an example of 1:4 rate
setting.
.
Trigger ▼
GENERAL IN
REC Frame
○ ○ ● ● ● ● ● ● ● ● ● ○ ○
Frame No. 1 2 3 4 5 6 7 8 9 10 11 12 13
Where the white circle denotes frames recorded at the lower rate and the black at
higher rate.
The START mode is the mode of recording used in the Dual Framing Rate mode.