Now this may or may not be of interest to you but I've used and found it quite useful. Might actually work with other bodies but have no way of confirming.
I've done a bit of reading around about the AF on the 5D3 and this was one I've tried. It's a way of combining 61 auto and Zone AF.
1. switch to AI Servo AF
2. select 61-point automatic selection AF (you should now see the whole AF area outlined and one single AF point for initial focus achievement)
3. select the AF point in the centre of the frame and save this point as your home-point via holding down the AF point selection button and pressing the LCD illumination button
5. now switch to Zone AF
If you use the shutter button the camera uses Zone AF for focusing on the selected Zone as you would expect, but if you press the AF-ON button the camera will immediately focus with 61-point automatic selection AF by initially acquiring focus on the previously saved home-point. This setup means you the option to quickly move between Zone AF and 61-point automatic selection AF so that you can adapt your AF system behaviour to rapidly changing conditions.
This was described in an article on DPReview.
I've done a bit of reading around about the AF on the 5D3 and this was one I've tried. It's a way of combining 61 auto and Zone AF.
1. switch to AI Servo AF
2. select 61-point automatic selection AF (you should now see the whole AF area outlined and one single AF point for initial focus achievement)
3. select the AF point in the centre of the frame and save this point as your home-point via holding down the AF point selection button and pressing the LCD illumination button
5. now switch to Zone AF
If you use the shutter button the camera uses Zone AF for focusing on the selected Zone as you would expect, but if you press the AF-ON button the camera will immediately focus with 61-point automatic selection AF by initially acquiring focus on the previously saved home-point. This setup means you the option to quickly move between Zone AF and 61-point automatic selection AF so that you can adapt your AF system behaviour to rapidly changing conditions.
This was described in an article on DPReview.
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