Nikon D4S User Manual
Page 376
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Choose Image Area
When Choose image area is selected, the button can be used in
combination with the command dials to cycle from FX-based movie
format to DX-based movie format to a 1920 × 1080 crop (except when
frame rates of 60p or 50p are selected, movies with a 1920 × 1080 crop
will be shot at the frame rate chosen for Movie settings > Frame size/
frame rate; when 60p or 50p is selected, movies with a 1920 × 1080
crop will be recorded at half the selected frame rate). The image area
can not be changed during shooting.
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