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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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Joined May 2008
Inverness, Highlands of Scotland
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?


Illegitimi non carborundum --- as they said in Roman times ---

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MalVeauX
"Looks rough and well used"
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Joined Feb 2013
Florida
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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Joined Oct 2011
Where I'm from is unimportant, it's where I'm going that counts.
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
Website/blog: danmarchant.com (external link)
Instagram: @dan_marchant (external link)
Gear Canon 5DIII + Fuji X-T2 + lenses + a plastic widget I found in the camera box.

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AI Servo .... do I need keep press BBF?
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