Nikon D4 - Focusing in Live View

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Image Area
Using an FX lens with movie live view gives you a choice of
two crops in addition to the standard FX-based format:
1. To record movies with a crop factor 2.7× that of an FX
format lens used with a non-DX image area, select a
“1920 × 1080 crop” option for Movie options > Frame
size/frame rate in the shooting menu. The e ective
lens focal length will increase by 2.7× for a telephoto ef-
fect and movies will be recorded at a higher quality than
when an FX-based movie format is used.
2. To record movies with a crop factor of 1.5×, select DX
for Image area > Choose image area in the shooting
menu. Note that movies recorded at this setting show a
slight drop in image-quality when compared to movies
recorded in an FX-based movie format.
FX-based movie
format
DX-based movie
format
1920 × 1080
crop
Crop factor: 1.5× Crop factor: 2.7×
Movies