- Function (Fn) button: Establish this button's behavior via the Assign Fn Button option, found on the Controls submenu of the Custom Setting menu and shown here.
You can assign any number of jobs to the Function (Fn) button.By default, pressing the button accesses the ISO setting; press the button while rotating the Command dial to change the ISO value. You also can choose from a list of other options, as shown on the right. (Scroll to the second page of the list to access all the options.)
To see an information screen that tells you what each Fn button setting does, tap the question mark icon at the bottom of the screen or press the Zoom Out button. To exit the information screen, tap the return arrow or press the Zoom Out button again.
- AE-L/AF-L button: This button is related to the autoexposure and autofocusing systems. You can set the button to perform the following functions via the Assign AE-L/AF-L Button option, also found in the Controls section of the Custom Setting menu:
- AE/AF Lock: This is the default setting. Focus and exposure remain locked as long as you press the button.
- AE Lock Only: Autoexposure is locked as long as you press the button; autofocus isn't affected. (You can still lock focus by pressing the shutter button halfway.)
- AE Lock (Hold): This one locks exposure only with a single press of the button. The exposure lock remains in force until you press the button again or the exposure meters turn off.
- AF Lock Only: Focus remains locked as long as you press the button. Exposure isn't affected.
- AF-On: Pressing the button activates the camera's autofocus mechanism. If you choose this option, you can't focus by pressing the shutter button halfway.
- Shutter button: The Timers/AE Lock section of the Custom Setting menu offers an option called Shutter-Release Button AE-Lock. This option determines whether pressing the shutter button halfway locks focus only or locks focus and exposure.
At the default setting, Off, only focus is locked; exposure is adjusted up to the time you take the shot. If you change the setting to On, your half-press of the shutter button locks both focus and exposure. (Remember that you also have the option of using the AE-L/AF-L button to lock exposure and focus together.)