Nikon D780 DSLR Camera (Body Only) - Manual (Page 803)

757 Troubleshooting
Focus-point selection is not available:
• Is the focus selector lock in the L (lock) position?
• Focus-point selection is not available when [ Auto-area AF ] is
selected for AF-area mode.
• Focus point selection is not available in playback mode or when
menus are in use.
• Has the standby timer expired? To enable focus-point selection,
press the shutter-release button halfway.
Image size cannot be changed:
[ Image quality ] set to [ NEF (RAW) ].
The camera is slow to record photos:
Is [ On ] selected for [ Long exposure NR ] in the photo shooting menu?