Selecting The Frame Rate; Switching Frame Rate (150 K And 775K Modes) - Photron FASTCAM SA5 Hardware Manual

3.2.

Selecting the Frame Rate

Images can be recorded with the system from 60 (50) to 7,000 fps using the full 1,024x1,024 pixel
resolution of the image sensor. For frame rates higher than 7,000 fps, high-speed recording is
achieved by limiting the read area of the image sensor. Binning is NOT used.
 The minimum frame rate in NTSC mode is 60 fps.
 The minimum frame rate in PAL mode is 50 fps.
 For frame rates faster than 1,080 fps, the resolution is automatically set to the maximum available
at that frame rate. For more details, refer to "5.1.4. Frame Rate and Resolution", page 70.
3.2.1.

Switching Frame Rate (150 K and 775K modes)

This camera has two different frame rate setting modes, which can be switched from one to the other
as needed. The modes are called the 150 K and 775 K modes where the numbers, 150 and 775,
represent the maximum speed of readout, or the frame rate, in killo frames per second. The details
of each mode are shown below:
150 K Mode
 The maximum frame rate is 150,000 fps (with image resolution of 128 x 16 pixels).
 The image resolution is slightly lower than that of the 775K mode at the same frame rate.
Example: The image resolution in the 150 K mode at 10,000 fps is 704 x 720 pixels,
while the image resolution in the 675 K mode at 10,000 fps is 768 x 768 pixels.
775 K Mode
 The maximum frame rate is 775,000 fps (with image resolution of 128 x 24 pixels).
 The image resolution is slightly higher than that of the 150 K mode at the same frame rate.
 The image quality of the 775K mode is lower than that of the 150K mode at the same frame
rate.
 There may be adverse effect introduced to the image quality (such as horizontal line-like noise)
when the frame rate or shutter speed is changed. To eliminate such a defect, calibration must be
carried out before resuming a recording with a new setting of frame rate and/or shutter speed (refer
to "3.1.1. Executing Calibration. Frame Rate and Resolution", page 22).
 The user may choose either mode depending on the frame rate and image quality required by the
particular application.
Table of frame rates and image resolutions, refer to "5.1.4. Frame Rate and Resolution", page 70.
23 FASTCAM SA5 / SA5 RV Hardware Manual