I don‘t use it for DoF on my 5D IV. I set it as a switch between One Shot AF and Servo AF. I just asked because it is nice to have more buttons you can use for different features. And I really like the position at the front because it‘s easy to reach with my ring finger.You can assign various buttons on the R for DoF. I found the location of the 5D dedicated ones way too awkward; plus, of course, the VF became too dark. So I rarely bothered. Now with the R, I use it frequently. So clear and convenient!
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