Nikon D800 User Manual (en)

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Focus.
Press the shutter-release button 
halfway or press the 
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 
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
AE-L/AF-L button