Nikon D780 DSLR Camera (Body Only) - Manual (Page 923)

877 AF-S NIKKOR 24–120mm f/4G ED VR Lens Manual
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Zoom and Depth of Field
Before focusing, rotate the zoom ring to adjust the focal length
and frame the photograph. If the camera offers depth-of-field
preview (stop down), depth of field can be previewed in the
viewfinder.
• The lens uses Nikon’s Internal Focusing (IF) system. Focal
length decreases as the focus distance shortens.
• The focus distance indicator is intended only as a guide and
may not accurately show the distance to the subject. In
addition, the focus distance indicator may, due to depth of
field or other factors, not show when the camera is focused
on a distant object.
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Aperture
Aperture is adjusted using camera controls.