How to activate the back focus button( af-on) on 5d markiii?

Started Oct 3, 2013 | Questions
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Mmwei Regular Member • Posts: 151
How to activate the back focus button( af-on) on 5d markiii?

Hi I heard the back focus button( Af-on)  is very useful on 5d mkiii,  but I couldn't activate it . Is there any pro could tell me how to do it and what is your experience about it ? I really appreciate your help.

thanks

mike

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Schwany
Schwany Forum Pro • Posts: 10,055
Re: How to activate the back focus button( af-on) on 5d markiii?

Google "back button focus 5DMkIII". There should be a couple of utube videos that will run you through the process.

AF-On is activated by default on most Canon cameras, but the way it is implemented is not what people refer to as back button focus. Usually people like to swap the AF-On button function with the AEL (asterisk) button. Then set up the shutter button to do metering and shutter release or only shutter release. My personal experience with back button focus is that it is a waste of time (I'm happily the odd man out), but I shoot manual exposure and don't need to separate focus from metering and shutter release. I don't focus and recompose either, so it buys me nothing. For others it is the only way to fly.

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Dan Marchant Senior Member • Posts: 2,341
Re: How to activate the back focus button( af-on) on 5d markiii?
1

The 5DIII has a dedicated AF-ON button to use for BBF. The only thing you need to do is disable AF on the shutter button. Go into the menu and scroll through to the C.Fn2 (Custom Function 2) menu and select the bottom option Custom Controls.

The first option on the Custom Controls menu is the Shutter Button. half-press. Select this and change it from Metering and AF start to just Metering start.

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Mmwei OP Regular Member • Posts: 151
Re: How to activate the back focus button( af-on) on 5d markiii?

hi thank you all for the very very helpful info. Not at home right now once i get back home ill try it out.
Thanks
Mike

BigBen08 Veteran Member • Posts: 5,119
Re: How to activate the back focus button( af-on) on 5d markiii?
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