Nikon D500 - Manual (Page 70)

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4
Focus.
Press the shutter-release button
halfway to focus.
The focus point will flash green and
the shutter release will be disabled 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 center of
the sub-selector (
0 141); focus locks while the shutter-
release button is pressed halfway.
D Using Autofocus in Live View
Use an AF-S or AF-P lens. The desired results may not be achieved
with other lenses or teleconverters. Note that in live view,
autofocus is slower and the monitor may brighten or darken while
the camera focuses. The focus point may sometimes be displayed
in green when the camera is unable to focus. 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 includes spot lighting or a neon sign or
other light source that changes in brightness
• Flicker or banding appears under fluorescent, mercury-vapor,
sodium-vapor, or similar lighting
• 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., blinds or a row of windows in a skyscraper)
• The subject is moving