Canon went from very few AF options to a gazillion in one model. Of course, there's the veteran full automatic AF selection. Spot AF is a sub-area of the traditional single-point AF, and for both of these you can choose from any of the 19 AF points. AF point expansion lets you choose any of the AF points plus the three or four (depending upon location) surrounding it.
Zone AF is similar to AF point expansion in that it allows you define clumps of points in the center, top, bottom or sides of the full AF area, but in contrast to expansion, where you still choose the primary focus point, the camera automatically chooses what to focus on within the defined zone. The bulk of these are really designed to improve focus tracking during burst shooting, and much like Nikon's AF system you have to think very carefully about matching the AF choice with the shooting situation.
Very few users need all of these options, and Canon provides a solid interface for enabling or disabling the choices to minimize on-the-fly confusion. And that M-Fn icon at the top is there to remind you how to cycle through the different zone options--you cycle through the points with the joystick or thumbwheel--which is pretty easy to forget.
December 10, 2009 10:49 AM PST
Photo by: Sarah Tew/CNET
| Caption by: Lori Grunin
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