Contax AX Instruction Manual page 51

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With the shutter release depressed halfway, return to
rJ the composition you want and take your picture by
depressing the shutter release all the way.
o While depressing on the shutter release halfway, the
focus remains locked so that the point at which the
lens is focused does not change even if you move the
camera.
o The focus lock is cancelled when removing your finger
from the shutter release.
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