Nikon AF-S DX Micro- NIKKOR 40mm f-2.8G - Manual (Page 15)

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M/A (Autofocus with Manual Override)
To focus using autofocus with manual override (M/A):
The Focus Limit Switch
This switch determines the focus distance limits for autofocus.
■ Aperture
Aperture is adjusted using camera controls. If the camera is in
exposure mode A or M, aperture will automatically be
adjusted by up to 1.2 stops to maintain the same effective
f-number at different focus distances.
■ Depth of Field
If the camera offers depth-of-field preview (stop down), depth
of field can also be previewed in the viewfinder.
z Slide the lens focus-mode switch to M/A.
x
Focus.
If desired, autofocus can be over-ridden by rotating the
lens focus ring while the shutter-release button is pressed
halfway (or, if the camera is equipped with an
AF-ON
button, while the
AF-ON button is pressed). To refocus
using autofocus, press the shutter-release button halfway
or press the
AF-ON button again.
FULL: Select this option for subjects that may be
closer than 0.2 m (0.7 ft).
∞–0.2 m: If your subject will always be at
distance of at least 0.2 m (0.7 ft), select this
option for faster focusing.