Nikon D800 - Manual (Page 70)

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Focus.
Press the shutter-release button
halfway or press the
B
button to focus.
The focus point will blink green while the
camera focuses. If the camera is able to
focus, the focus point will be displayed in
green; if the camera is unable to focus,
the focus point will blink red (note that
pictures can be taken even when the
focus point blinks red; check focus in the
monitor before shooting). Exposure can be locked by pressing
the
A AE-L/AF-L button (0 128); focus locks while the shutter-
release button is pressed halfway.
A
Exposure Preview
During live view photography, you can
press
J to preview the effects of shutter
speed, aperture, and ISO sensitivity on
exposure. Exposure can be adjusted by
±5 EV (
0 130), although only values
between –3 and +3 EV are reflected in the
preview display. Note that the preview may
not accurately reflect the final results when flash lighting is used,
Active D-Lighting (
0 174), High Dynamic Range (HDR; 0 176), or
bracketing is in effect, A (auto) is selected for the Picture Control
Contrast parameter (
0 166), or p is selected for shutter speed.
If the subject is very bright or very dark, the exposure indicators will
flash to warn that the preview may not accurately reflect exposure.
Exposure preview is not available when A is selected for
shutter speed.
B button
A AE-L/AF-L button