Move FOCUS lock to the * button, not exposure. CF.N 04 = 1 on most bodies. That will put AF lock on * and keep AE lock on the shutter button (at the point of half press). The reason is that you don\'t want to lock ambient EXPOSURE until after you have focused and recomposed. That allows evaluative metering to compare ambient and pre-flash on same scene.
Workflow is:
1) Frame to put center AF point on eyes. Press * to lock AF but keep finger OFF the shutter.
2) Reframe as you plan to shoot. Half-press the shutter. That will lock the ambient exposure reading in Av mode (AE lock).
3) Then without releasing the shutter from half-press, press it completely to take the shot. At full press the pre-flash will fire. The metering will compare it zone-to-zone with the ambient reading stored at the point of AE lock (half-press).
Shifting FOCUS LOCK to * allows you to focus/recompose without screwing up the metering as it would be if you lock AF and AE at the same time, before you recompose. The AE lock and pre-flash need to occur with the camera pointing at the same place.
Dec 12, 2008 at 11:09 AM
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