Samsung NX1 user manual 186, Set the function for the AF start button

Camera settings menu > User settings

	* Default
Option	Description
AFL Hold	Keep the auto focus lock function on after shooting.
	(The focus remains locked even after you capture a
	photo.)
AEL + AFL	Perform the auto exposure and focus lock functions
	together.
AEL+AFL Hold	Keep the auto exposure and focus lock functions on
	together after shooting. (The exposure and focus
	remain locked even after you capture a photo.)
FEL	Perform the flash intensity lock function. (p. 121)
FEL Hold	Keep the flash intensity lock function on after
	shooting. (The intensity remains locked even after you
	capture a photo.) (p. 121)

AF ON

Set the function for the AF start button.

	* Default
Option	Description
AF Start	Perform the auto focus function.
	Perform the auto focus function. Keep the auto
AF Start + Lock	exposure and focus lock functions on after shooting.
	(The exposure and focus remain locked even after you
	capture a photo.)
Metering & AF	Set an optimum exposure by calculating the
	brightness of the focus area and perform the auto
start*
	focus function at the same time.
	Set an optimum exposure by calculating the
Metering & AF	brightness of the focus area and execute the auto
	focus function at the same time. Keep the auto
Start + Lock	exposure and focus lock functions on after shooting.
	(The exposure and focus remain locked even after you
	capture a photo.)

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