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In each exposure mode except Manual mode, the level for the entire screen is
calculated, and the optimum Iris, Gain and Shutter levels are determined. In Spot
Exposure, a particular section of the subject can be designated, and then that portion
of the image is weighted and the value calculated so that Iris, Gain and Shutter are
optimized to obtain the entire screen image.
This mode can be set using On/Off Command in CAM_Spot AE Command.
For example, in an image with frequent changes of brightness by a lot of movement,
portions without much change can be designated as such a "spot," and changes to the
screen can be minimized.
As shown in the diagram below, a spot block in a range of 16 blocks vertically and 16
blocks horizontally can be designated. In the case where the center block is
designated (shown in yellow), the level is calculated along with a weighted value for
the surrounding blocks (blue) and the specified center (yellow) block, and then the Iris,
Gain and Shutter are set. The weight of the center (yellow) block is 100% and the
weight of surrounding blocks (blue) is 20%. The range of the Spot AE frame is fixed to 3
blocks vertically and 3 blocks horizontally.
Since Spot Exposure and Back Light Compensation cannot be set at the same time,
please use it after setting Back Light Compensation to Off.
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Spot photometry: center area
Spot photometry: surrounding area
The above coordinate is selected by Position Command of CAM_Spot AE Command.
It is an example which is set using 8X 01 04 29 00 03 00 02 FF command when the
coordinate is x=3, y=2.
Tamron Co., Ltd.
3.7 Spot Exposure
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