Photron FASTCAM SA-X2, Hardware Manual

Page: 44 / 74

FASTCAM SA-X2 44
2.2 Selecting Shutter Speed
• The exposure starts at the rising edge of the EXPOSE POS signal (or the falling edge of the EXPOSE
NEG signal). The exact exposure end point is on the preceding of the falling edge of the EXPOSE
POS signal in the range of maximum ⊿ t second (referred to below as exposure uncertain interval)
and the position of the point varies according to the integral of the quantity of light input to the
camera. Moreover the relation between the light input and the output of the camera is non-liner
during the exposure uncertain interval as it is different from the other exposure intervals. (The red
diagonal areas on the chart on the right page shows the exposure uncertain intervals.)
• The uncertain interval ⊿ t depends on a mode setup as a following table.
Setup Uncertain intervals
13.5K mode is ON Approx. 700nsec
13.5K mode is ON
with a frame rate in the following table
Approx. 198nsec
13.5K mode is OFF Approx. 1.11usec
Resolution
(Horizon)
Resolution (Vertical)
64
56 48 40
1,024 over 224,001 fps over 240,001 fps over 262,501 fps over 300,001 fps
896 over 240,001 fps over 262,501 fps over 288,001 fps over 315,001 fps
768 over 262,501 fps over 288,001 fps over 315,001 fps over 350,001 fps
640 over 300,001 fps over 315,001 fps over 350,001 fps over 360,001 fps
512 over 336,001 fps over 360,001 fps over 360,001 fps over 400,001 fps
384 over 360,001 fps over 400,001 fps over 400,001 fps over 480,001 fps
256 over 400,001 fps over 450,001 fps over 504,001 fps over 525,001 fps
128 over 525,001 fps over 560,001 fps over 560,001 fps over 600,001 fps
Resolution
(Horizon)
Resolution (Vertical)
32 24 16 8
1,024 over 336,001 fps over 360,001 fps over 450,001 fps over 525,001 fps
896 over 360,001 fps over 400,001 fps over 480,001 fps over 560,001 fps
768 over 360,001 fps over 450,001 fps over 504,001 fps over 600,001 fps
640 over 400,001 fps over 480,001 fps over 525,001 fps over 630,001 fps
512 over 450,001 fps over 525,001 fps over 560,001 fps over 672,001 fps
384 over 504,001 fps over 560,001 fps over 630,001 fps over 700,001 fps
256 over 560,001 fps over 630,001 fps over 672,001 fps over 720,001 fps
128 over 630,001 fps over 700,001 fps over 720,001 fps over 800,001 fps