Nikon F50 instruction manual Shutter release button

3 Press the AE-L button and hold it.	While keeping the AE-L button pressed,
	4 recompose the picture, then fully depress the
	shutter release button .

In Single Servo AF mode, if recomposing the picture could change subject-to-camera distance, refocus by briefly removing your finger from the

shutter release button and lightly pressing it again (while holding the AE-L button).

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