Photron Fastcam BC2 HD, Hardware Manual

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3. Recording
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3.4. Selecting the Shutter Speed
The shutter speed is independent of the frame rate, so you can control the exposure time in one
frame using the electric shutter. By making an exposure that is of a shorter period than the frame rate,
high-speed objects can be recorded blur-free.
The shutter speed can be set from 1/frame s to a maximum of 1/367,000 s (approximately 2.76 μ s).
The shutter speed display can be switched between "1/xxx S" and "0.xxx S".
• The numerical value of "0.xxx S" is the actual exposure time.
The numerical value of "1/xxx S" is a round figure. It differs slightly from the actual exposure time.
•
For more details about the shutter speed, see "5.1.6 Shutter Speed List", page 57.
3.4.1. Changing SHUTTER MODE
By switching between [MODE1] and [MODE2] on the [SHUTTER MODE] submenu on the
[SHUTTER] menu, the shutter speed value first used when the frame rate is changed can be set.
MODE1
: Changing the frame rate automatically sets the shutter speed to 1/frame s.
MODE2
: Changing the frame rate does not change the shutter speed, it maintains the current
setting.
3.4.2. DS SHUTTER Setting
DS SHUTTER is a mode that records the high brightness portion and low brightness portion in
one image at the same time by adjusting the light exposure internally in the sensor. By using this
function, when recording a subject with an extremely large difference in the brightness in the image,
the sensor functions so that it can record at the proper light exposure for both the high brightness
and low brightness portions.
The light exposure adjustment can be set from 0% to 95% in 5% increments according to the
difference in brightness of the subject.
• This function cannot be used with the operations below.
■
When the AUTO EXPOSURE function is used
■
When the trigger mode is RANDOM RESET
• When using the DS SHUTTER function on color models, there may be situations where the colors
are unbalanced and the color reproducibility degrades.
• The adjustment amount is expressed as %. For the adjustment strength, 0% is no adjustment, 95%
is the maximum effect.