FujiFilm 90 - Manual (Page 34)

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With the AF frame positioned over the subject, press down the shutter release but-
ton halfway to set the auto-focus lock.
☞ Check that the AF lamp (green) lights up.
3
4
While holding the shutter release button halfway down to keep the Auto-Focus lock
on, move the camera back to the original position to recompose your picture, then
press the shutter release button all the way down.
∗
The Auto-Focus lock operation can be repeated any number of times before the shutter trips.