Nikon D810 - Manual (Page 60)

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4
Focus.
Press the shutter-release button
halfway to focus.
The focus point will flash 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
flash red (note that pictures can be
taken even when the focus point
flashes 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 (0 182),
High Dynamic Range (HDR; 0 184), or bracketing is in effect, A
(auto) is selected for the Picture Control Contrast parameter
(0 174), or a value other than 0 is selected for Clarity (0 174), 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 or & is selected for shutter speed.
A AE-L/AF-L
button