Nikon D90 - Manual (Page 67)

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D Face-Priority AF
The camera’s ability to detect faces depends on a variety of factors, including whether or not
the subject is facing the camera. The camera may be unable to detect subjects that are not
facing the camera or faces that are hidden by sunglasses or other obstructions or that take up
too much or too little of the frame. If no face is detected when the shutter-release button is
pressed halfway, the camera will focus on the subject in the center of the frame.
The camera will continue to focus until a face is detected or the shutter-release button is
pressed halfway. If a flashing double red border is displayed, the camera is unable to focus;
recompose the picture and try again.
D Using Autofocus in Live View
Autofocus is slower in live view. The camera may be unable to focus in the following situations:
• The subject contains lines parallel to the long edge of the frame
• The subject lacks contrast
• The subject in the focus point contains areas of sharply contrasting brightness, or the
subject is lit by spot lighting or by a neon sign or other light source that changes in
brightness
• A cross (star) filter or other special filter is used
• The subject appears smaller than the focus point
• The subject is dominated by regular geometric patterns (e.g., windows in a skyscraper)
• The subject is moving
Note that the focus point may sometimes be displayed in green when the camera is unable to
focus.
Use an AF-S lens. The desired results may not be achieved with other lenses or teleconverters.
A The Shooting Information Display
To hide or display indicators in the monitor in live view mode, press the R button.
A HDMI
When the camera is attached to an HDMI video device, the
camera monitor will turn off and the video device will display
the view through the lens as shown at right.
Shooting information
off
Shooting information
on
Exit
Framing guides
(zoom not available)
Exit