Nikon AF-S DX NIKKOR 18-300mm f/3.5-5.6G ED VR, User Manaul

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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.
Note:
Focal length decreases as the focus distance shortens. Note that
the focus distance indicator is intended only as a guide and may not
accurately show the distance to the subject and may, due to depth of
field or other factors, not show
∞
when the camera is focused on a
distant object.
To lock the zoom ring, rotate it to the 18 mm position and slide the
zoom lock to LOCK . This prevents the lens extending under its own
weight while the camera is being carried from place to place.
■
Aperture
Aperture is adjusted using camera controls.
Zoom and Maximum Aperture
Changes to zoom can alter the maximum aperture by up to 1
1
/
3
EV.
The camera however automatically takes this into account when
setting exposure, and no modifications to camera settings are
required following adjustments to zoom.