Nikon Df - Manual (Page 361)

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Shooting
Camera takes time to turn on : Delete files or folders.
Shutter-release disabled :
• Memory card is locked, full, or not inserted (0 19, 29).
• Release locked is selected for Custom Setting f9 (Slot empty release
lock; 0 269).
• Camera is not in focus (0 32).
• Aperture ring for CPU lens not locked at highest f-number (does not
apply to type G and E lenses). If B is displayed in control panel, select
Aperture ring for Custom Setting f7 (Customize command dials) >
Aperture setting to use lens aperture ring to adjust aperture (0 267).
• CPU lens attached with metering coupling lever raised (does not apply
to type G and E lenses; 0 167).
Camera is slow to respond to shutter-release button : Select Off for Custom Setting
d10 (Exposure delay mode; 0 256).
Only one shot taken each time shutter-release button is pressed in continuous release
mode
: Turn HDR off (0 112).
Photos are out of focus :
• Rotate focus-mode selector to AF (0 59).
• Camera unable to focus using autofocus: use manual focus or focus lock
(0 66, 68).
• The shutter-release button can not be used to focus when AF-ON is
assigned as the Press option for Custom Setting f4 (Assign Fn button,
0 263), f5 (Assign preview button, 0 266), or f6 (Assign AE-L/AF-L
button, 0 267). Use the button to which AF-ON is assigned.
Shutter speed can not be adjusted using the command dials : Flash in use. Flash sync
speed can be selected using Custom Setting e1 (Flash sync speed); when
using compatible flash units, choose 1/250 s (Auto FP) or 1/200 s (Auto
FP) for full range of shutter speeds (0 257).
Focus does not lock when shutter-release button is pressed halfway : Use A AE-L/AF-L
button to lock focus when AF-C is selected for focus mode.