Copyright © 2015-19 Clive Dyson Version 4.5 12
Focusing, focus lock and manual focusing
In AFF and AFC focus modes, focus is only locked when you fully depress the shutter button. You cannot
adjust focus using the focus ring and AF LOCK has no effect.
In AFS focus mode, focus is locked when you half-press the shutter button
. You can adjust the focus,
using the focus ring on the lens, without switching to manual focus, in one of two ways:
1. Press and release the AF LOCK button
to take and lock focus. You can then turn the focus ring to
adjust focus without having to hold a button down. Exposure will subsequently be locked when you
half-press the shutter button, thereby separating where (and when) focus and exposure are locked.
2. Half-press the shutter button to lock focus (and exposure) and keep it half pressed. You can then use
the focus ring to adjust focus.
Edges that are in focus will be highlighted: a capability referred to as focus ‘peaking’. If necessary, enlarge
the focus area by pressing the AF MODE button. The enlarged area can be moved using the cursor keys
and its magnification varied using the rear dial. You could press BACK to close the enlarged area.
Turn the focus ring on the lens to bring your subject into sharp focus. An indicator will appear, showing
roughly at what distance you are focused (there is no distance scale).
Both of the above options use manual focus, without having to switch to MF focus mode explicitly. Of
course, you can always select MF on the MF/AF switch and manual focusing will operate in the same
way.
Where does auto-metering evaluate the exposure?
Where exposure is taken depends on the AF mode and the metering mode used, as shown in Table 3.
Note that the combinations shaded in green in Table 3 explicitly link where focus and exposure are taken.
Average over the
scene, weighted
to the centre of
the frame.
At the centre of the AF region.
At the centre of the image.
At the centre of the image.
At the centre of the AF area.
At the centre of the MF Assist region.
Table 3: Where exposure is taken for each combination of AF and metering modes
In practice, I find FACE DETECTION AF mode with MULTI metering mode are an excellent combination
for stationary subjects, because it switches to 49-AREA AF mode if no faces are detected and pressing
FOCUS AREA SET switches to 1-AREA AF mode with a form of spot metering.
1-AREA AF mode and SPOT metering are a good combination for moving subjects.
Unless SHUTTER AF is OFF or you have already pressed AF LOCK to lock focus.
Programmed in the setup to function as AF LOCK. AF/AE LOCK HOLD is set to ON, so that you don’t have to
keep the AF/AE LOCK button depressed.
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