Isolate focus, shutter AND metering?

Started Feb 16, 2014 | Questions thread
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Al Downie
Contributing MemberPosts: 995Gear list
Isolate focus, shutter AND metering?
Feb 16, 2014

Hi all,

Notwithstanding recent discussions about the problems associated with focus+recompose, it'll probably still be my preferred method of shooting family photos at a distance. And because of that, I've disabled focussing with the shutter release of my 5D mkIII, and only use the back AF button. However! Today I was shooting a backlit scene, and found that every time my subject moved and prompted me to check focus, pressing the back focus button would disengage my AE lock so the evaluative mode would underexpose.

Is there any way to completely isolate the following three buttons/functions:

• Shutter release - ONLY operate shutter - no metering

• Back focus - ONLY operates AF - no metering

• AE lock - takes a reading and locks exposure settings until next press?

Or if I'm missing a much simpler method of dealing with moving backlit subjects using focus+recompose, I'd be very grateful for pointers!



 Al Downie's gear list:Al Downie's gear list
Canon EOS 5D Mark III Canon EF 50mm f/1.2L USM Canon EF 135mm f/2.0L USM Canon EF 40mm f/2.8 STM +1 more
Canon EOS 5D
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