Sony DVS-9000 User Manual page 92

You can also choose to display only the portion of the image that is seen
through the lens.
Circle
Makes a circle with the image.
You can set the size of the circle, and make the axis of modulation vertical.
Panorama
Curves the upper and lower edges of the image to emphasize the sense of
perspective.
You can set the horizontal and vertical curve ratio, and the curve center
position.
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Digital Multi Effects (DME)