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Contrast between flip preview images (Equivalent to the image
rotated by 180 degrees)
2.1.4.2 Zoom out and Zoom in
Under preview resolution of 640 × 480,800 × 600,1024 × 768, click "Zoom
out" and "Zoom in" button, or click the seekbar directly with your mouse to
zoom in and out the preview screen.
2.1.4.3 Actual Size (1:1)
The field angle is variable and defaults to intermediate position. If it is more
than the current software preview range, you can press the left mouse button
to drag. Under fit the screen mode, the field angle defaults to middle
position.
2.1.4.4 Fit the Screen
Fit preview range of the current software. The field angle remains the same
and the maximum screen does not exceed the preview range. If smaller than
the preview range, the screen is the actual size (such as 640 × 480).
