Fujifilm X100F Manual Do Proprietário

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 Focus/Exposure Lock
 Focus/Exposure  Lock
To compose photographs with off -center subjects:
  1
 Focus: Position the subject in the focus frame and press the shutter button half-
way to lock focus and exposure.  Focus and exposure will remain locked while 
the shutter button is pressed halfway (AF/AE lock).
P
 
AEL/AFL button.  The role played by the AEL/AFL button can be chosen using D BUTTON/DIAL SETTING > 
FUNCTION (Fn) SETTING (
P 47): choose from AE LOCK ONLY (pressing the AEL/AFL locks exposure but not 
focus), AF LOCK ONLY (pressing the AEL/AFL locks focus but not exposure), and AE/AF LOCK (pressing the 
AEL/AFL locks both focus and exposure).
  2
 Recompose: Keep the shutter button pressed halfway or keep the AEL/AFL button 
pressed.
 
R Focus and/or exposure will remain locked while the AEL/AFL button is pressed, whether 
or not the shutter button is pressed halfway.  If AE&AF ON/OFF SWITCH is selected 
for 
BUTTON/DIAL SETTING > AE/AF-LOCK MODE (P 122), focus and/or exposure 
lock when the button is pressed and remain locked until the button is pressed again.
P
  3
 Shoot: Press the button all the way down.