Nikon D7200 - Shooting (All Modes); Camera Takes Time to Turn On: Delete Files or Folders; Camera Is Slow to Respond to Shutter-Release Button; Photos Are out of Focus

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Shooting (All Modes)
Camera takes time to turn on: Delete files or folders.
Shutter-release disabled:
• Memory card is locked, full, or not inserted (0 22, 29).
• Release locked is selected for Custom Setting f7 (Slot empty release
lock; 0 286) and no memory card is inserted (0 29).
• Built-in flash is charging (0 36).
• Camera is not in focus (0 34).
• 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 f5 (Customize command
dials) > Aperture setting to use lens aperture ring to adjust aperture
(0 285).
• Non-CPU lens is attached but camera is not in mode A or M (0 51).
Camera is slow to respond to shutter-release button: Select Off for Custom
Setting d4 (Exposure delay mode; 0 280).
No photo taken when remote control shutter-release button is pressed:
• Replace battery in remote control.
• Choose an option other than Off for Remote control mode (ML-L3)
(0 156).
• Flash is charging (0 158).
• Time selected for Custom Setting c5 (Remote on duration (ML-L3),
0 279) has elapsed.
• Bright light is interfering with remote.
Photos are out of focus:
• Rotate focus-mode selector to AF (0 83).
• Camera unable to focus using autofocus: use manual focus or focus
lock (0 93, 97).
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 or when
photographing moving subjects in AF-A mode.