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FORUMS Photography Talk by Genre Sports Talk 
Thread started 17 Sep 2017 (Sunday) 13:25
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AI Servo .... do I need keep press BBF?

 
TheLaird
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Sep 17, 2017 13:25 |  #1

I have switched to back button focus.

I find the runner I want to shoot, and press my BBF.

I am in AI Servo and High Frame rate.

BBF is focused and I press the shutter button. All is in focus.

As the subject moves and I keep my finger on the shutter button, do I need to keep pressing BBF or will the AI Servo keep it in focus?


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MalVeauX
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Sep 17, 2017 13:26 |  #2

TheLaird wrote in post #18454278 (external link)
I have switched to back button focus.

I find the runner I want to shoot, and press my BBF.

I am in AI Servo and High Frame rate.

BBF is focused and I press the shutter button. All is in focus.

As the subject moves and I keep my finger on the shutter button, do I need to keep pressing BBF or will the AI Servo keep it in focus?

Keep pressing the BBF button and focus will continue to track. Release it and it stops focusing.

Very best,


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Dan ­ Marchant
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Sep 17, 2017 21:53 |  #3

It depends how you configured the shutter button. Most people set shutter button to Meter Only - focusing is exclusively done by the AF On/Back Button. In that case, yes, you need to keep pressing the BB to focus.


Dan Marchant
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AI Servo .... do I need keep press BBF?
FORUMS Photography Talk by Genre Sports Talk 
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