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Old Jul 10, 2010, 3:23 PM   #11
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I don't have my camera with me currently so not sure what option 2 is, what does it say?
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Old Jul 10, 2010, 9:19 PM   #12
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Here is what Canon says
1: Metering + AF start / AF stop

AF is still at shutter button. Pressing the rear button will actually LOCK the focus; potentially useful if you shoot a lot of moving subjects in AI Servo AF and prefer to activate AF with a conventional half-press of shutter button. Focus is unlocked by removing thumb from back-button.

2: Metering start / Meter + AF start

Back-button AF activation. Shutter button no longer activates AF, but of course fires the shutter. Metering is continuously updated — if you shoot a sequence of pictures, the camera takes a fresh meter reading for each one. There’s no locking of exposure, unless you separately press the AE Lock button (this last item is not possible on some EOS models).

3: AE Lock / Metering + AF start

Back-button AF activation. Difference between this setting and option 2 directly above is that when you press the shutter button half-way, your exposure is locked and won’t change until you pull your finger off the button entirely. Thus, if you shoot a sequence of pictures in any auto exposure mode, the exposure setting used for the first shot is used for each subsequent shot. Can be useful if you were using back-button AF to easily lock focus and shoot a series of portraits, where you wouldn’t expect lighting to change.

4: Metering + AF start / Disable

Similar to setting “0” above, but now, the camera’s rear AF-ON button is disabled. AF activation is at the shutter button. Convenient if you’re worried about accidentally pressing the back-button and don’t want to use back-button AF.
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Old Jul 11, 2010, 2:10 AM   #13
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Thanks for the info. For me when shooting a sequence I want the same exposure for all shots, and actually 75% of the time I'm shooting in a continuous mode using the rear only focus I will be using Manual exposure anyway so makes no difference. If someone needs the exposure to change during a sequence then 2 is the best to go for, if consistency is wanted then go for 3, or use manual with either.
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Old Jul 11, 2010, 10:31 AM   #14
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Thanks, I just realized a couple of days ago that I could set this up on the T2i, so I am trying it out.
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