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Honored Contributor
Posts: 5,817
Registered: ‎11-13-2012

Re: Canon Knowledge Base Lacking In 7D MarkII AF Topics

I assume you know this, but:

1. A camera can only focus at one distance at a time

2. The Canon AF system selects the focus point based on the closest item covered by a focus point with sufficient contrast to activate the phase detection system.

3. AF Expansion starts with the selected focus point first and then looks to the expansion points if the primary point cannot achieve focus.

4. Zone AF has no preferential focus point and will simply select the point that latches on the closest subject with sufficient contrast using any of the focus points in the zone.
John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
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Posts: 8,316
Registered: ‎08-13-2015

Re: Canon Knowledge Base Lacking In 7D MarkII AF Topics

Zone AF does not have to select it’s starting point.  

 

30C78D50-633C-48F3-AB84-C347B9FD0B2E.jpeg

 

You can select a starting AF point for Zone AF Tracking when in AI Servo mode.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
Honored Contributor
Posts: 5,817
Registered: ‎11-13-2012

Re: Canon Knowledge Base Lacking In 7D MarkII AF Topics


@Waddizzle wrote:

Zone AF does not have to select it’s starting point.  

 

Exactly. As I said above, but explained in more detail:

 

https://support.usa.canon.com/kb/index?page=content&id=ART133839

 

 


 

John Hoffman
Conway, NH

1D X, Rebel T5i, Many lenses, Pixma PRO-100, MX472, LRCC Classic
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