Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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B The Setup Menu: Camera Setup

❚❚ Assign AE-L/AF-L Button

Choose the role played by the 

A (L) 

button.

❚❚ Shutter-Release Button AE-L

If On is selected, exposure will lock when the shutter-release 
button is pressed halfway.

❚❚ AF Activation

Choose whether the camera focuses when the shutter-release 
button is pressed halfway.

B

Focus and exposure lock while the 

A (L) button 

is pressed.

C

Exposure locks while the 

A (L) button is 

pressed.

E

Exposure locks when the 

A (L) button is 

pressed, and remains locked until the button is 
pressed a second time or the standby timer 
expires.

F

AF lock only Focus locks while the 

A (L) button is pressed.

A AF-ON

The 

A (L) button initiates autofocus.

A (L) button