BBF, AF and AI Servo

Started 3 months ago | Discussions thread
Lee Jay Forum Pro • Posts: 55,390
Re: BBF, AF and AI Servo

stevet1 wrote:

I just got into back button focus, and I like it a lot. It's a lot quicker, I think, but I have a question.

I haven't had a chance to experiment with moving subjects yet, so I'm not sure of something.

If I am in AI Servo mode, do I keep my finger on the BBF button as I follow the subject,


or should I keep my finger off the button and let the AI Servo take care of things?

AI Servo will be off if you aren't holding the button.

If I keep my finger on the BBF button, are the autofocing and the AI Servo working at cross purposes?

Does BBF work best in single shot mode?

If I understand it, AI Servo works best when the subject maintains the same distance,

No, that's not true at all.  It's entire purpose is to predictively AF on subjects with changing distance.

but what if you have somebody running let's say a zigzag pattern, moving either toward you, or away from you?

How should I handle that?

Hold the button down.

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