Canon XF100 Instruction Manual page 122

Video Output Configuration
SD Output
When HD video (16:9 aspect ratio) is converted and output as SD video
(4:3 aspect ratio), you can choose how it appears on the external monitor.
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1 Open the [SD Output] submenu.
[N Video Setup]
2 Select the desired option and then press SET.
Options
[Squeeze]: The image is squeezed from the left and right so that the entire image fits within the screen. The image
will appear normal if the external monitor also has a 16:9 aspect ratio.
[Letterbox]: The 16:9 aspect ratio is maintained but black letterbox bars are added to the top and bottom of the
image.
[Side Crop]: The left and right sides of the image are cropped so that the central part of the image fits within the
screen.
[Squeeze]
setting
[SD Output]
[Letterbox]
setting
[N Video Setup]
[SD Output]
[Squeeze]
[Side Crop]
setting