Canon 5D Mark III Experience
With certain lenses (listed in the Canon manual as groups F to H on pages 83-84) the number of available AF points from which to manually select will be fewer. Also note that with the settings that limit the number of points to less than 61 Points, the AF Point Expansion and Zone AF Autofocus Area Modes will still function and take advantage of all 61 points. You may find that a combination of fewer AF Points (41 or 15) combined with an AF Point Expansion Autofocus Area Selection Mode will allow you to work more quickly, easily, and/ or accurately.
Select AF Area Selection ModeThis setting is to enable or disable the different autofocus AF Area Selection Modes so that you will be able to choose from them all, or so that you can limit the number of modes available for selection. When setting this menu item, turn the Quick Control Dial to select the desired modes, then the SET Button to activate or de-activate (see Figure 21). You may wish to enable all of them at first and experiment with the different modes, and then later disable the ones you find that you do not wish to use. That way when you are later quickly selecting between the different AF Area modes, you won’t have to “click” through all the options to get to the mode you desire. More about the Autofocus - AF Area Selection Modes, the differences between them, and their uses later in the Autofocusing chapter of this text.
Figure 21 - Select AF Area Selection Mode menu to choose which AF Area Selection Modes will be available for you to select.
