Olympus i-SPEED 2, Instructions Manual

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Software reference (CDU) i--SPEED 2
64
i
--SPEED LT,
i
--SPEED 2
Data Logger Timing -- an explanation
The data logger records data for the entirety of each frame period
regardless of the shutter setting. This feature is included so that
the user is able to detect events which happen faster than the
frame period and which may be blurred, missed by the video
recording (or missed if a short shutter time is used).
When a short shutter time is employed, a question arises as to
what data should be logged. The diagram below shows the action
of the data logger with a shutter setting of x1. In this example, it
can be seen that the sensor gathers an image for the whole frame
period and the data logger gathers data for the same period. In this
way, the data and the image are correlated.
Frame period
Sensor integration
Incoming signal
Signal recorded
All of the data is collected while
the camera collects an image
SHUTTER x1
If the shutter is now increased to x2, the
i
-- SPEED 2 still gathers
data for an entire frame period, but it only gathers the image for half
the frame period. It should be noted that the
i
-- SPEED 2 records
data from the time in the preceding frame when the shutter closes
through to the time in the current frame when the shutter closes.
Frame period
Sensor integration
Incoming signal
Signal recorded
SHUTTER x2
...this section of data
has not yet come
into the camera...
At the point picture
collection finishes here...
...so it is included
in the next frame.