What is Back Button Focus all about?

Started Mar 25, 2014 | Discussions thread
WilbaW Forum Pro • Posts: 11,590
Re: What is Back Button Focus all about?

seeker moc wrote:

I think the misunderstanding comes from the ambiguity of the term 'lock'. I think that WilbaW is using the term as it the focus 'locks on' to a subject and continues to vary focus to tracked the 'locked' subject; whereas Phhoenyxx is thinking of 'lock' as in the focus 'locks' at the current focal distance, and doesn't change even if the subject and/or camera moves.

No, I mean "lock" as in hold the focus where it is now, like you get when One-shot confirms focus, or when you tell AI Servo to stop. Conventional BBF just means you trigger AF independently of pressing the shutter button. You don't press the back button to lock focus, you press it to start autofocus (though it can be configured that way but that's not the context of this discussion).

Is there more proper terminology to distinguish between the two?

One-shot locks, Servo tracks.

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