Matrix Vision mvBlueFOX3 Technical Manual page 231

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Note
It is not enough to use "Setting -
Rate" for this, as there are small fluctuations in this frame rate if the exposure time changes. These fluctuations
lead to oscillations (see settings marked with red boxes in Figure 1). The "Acquisition Frame Rate" will only
provide the exact frame rate if auto exposure is turned off.
As shown in Figure 1, it is possible to set ("mv Exposure Auto Mode") which part of the camera handles the auto
expose (device or the sensor itself; pink boxes). Using "mvSensor" as "mv Exposure Auto Mode", it is possible
to avoid oscillations in some cases. The reason for this behavior is that you can set more parameters like "mv
Exposure Auto Delay Images" in contrast to "mvDevice". However, as mentioned above it is recommended to use a
timer based trigger when using auto expose together with continuous acquisition.
Base - Camera - GenICam - Acquisition Control - Acquisition Frame
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