AGFA 307 Owner's Manual page 18

7. Focus on subject
Align the subject within the focus frame and press the shutter-release
button partway down to activate the autofocus. The focus lock
indicator will glow when the subject is in focus.
8. Take the picture
Check that the standby lamp in the viewfinder is illuminated. Gently
press the shutter-release button all the way down to take the picture,
the way you want it.