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Canon 5D Mark III Experience
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Release - This option will prioritize shutter release, or immediately capturing the shot at
the possible expense of exact focus.
AF Priority - This option will prioritize focus for the shot, ensuring that the subject is in
focus before the picture is taken. This may cause a brief, perhaps micro-seconds delay
while the camera confirms focus before releasing the shutter.
AF4
Lens Drive When AF Impossible
This setting tells the camera what to do when it is unable to find focus using autofocus.
It either keeps trying if set to Continue focus search, or it stops trying if set to Stop focus
search. I suggest you have it stop trying, especially when using a long telephoto lens,
and either manually focus to help the camera find the right range to work in, manually
select your focus point and aim it where you want it, find something with more contrast
or a detail to focus on, or realize that you are too close to your subject for the lens to
focus.
Selectable AF Point
This setting determines how many of the 61 autofocus points are available for you to
select from when using one of the Manual Selection Autofocus Area Modes. Note that
the actual visibility of the points in the viewfinder will be determined by the setting in the
AF5 menu, AF Point Display During Focus. Also note that all of the other points may
still be used by the camera to assist with focus and focus tracking, based on the AF
Mode and AF Area Selection Mode you are using. See the Autofocus - AF Area
Selection Modes section of this text for more information on using the AF Points.
Figure 19 - Selectable AF Point menu to determine how many AF Points you will be
able to choose from when shooting.