"AI Servo" isn't really an option for you becasue you mentioned you want to lock focus and not have it update when you re-compose. I was doing this in "AI Servo" mode because the last event I was shooting was a cycling event.
In "AI Servo" it will update continuously as you move the camera around. in "One Shot" it only updates metering if you release & re-activate the metering button. Record your results in the reply to this. I spoke to Canon and they confirmed that there is no way around this. You can then recompose the shot if desired. While you hold down the shutter button halfway, the focus will be locked. With evaluative metering (p.253), the exposure setting will be set at the same time as focus is achieved. Move the camera, keeping the focus locked with the half-shutter press, point at a lighter or darker area - I get the same meter reading - it does not change.Īlso, from the Canon Mark IV Manual, Look at the meter (shutter speed, Aperature and ISO) Reads - 1.4, 60, 200 ISOĤ. Set first on One Shot next on AI Focus.Ĥ Press the shutter half way, confirn focus lockĥ. I am doing the below with both the III and IV right now.ģ. As much as I wish you were correct, you demostrably not. That version (the "Hold") maintains the exposure lock until you cancel it. that clears an AE Lock.) The other version is an AE Lock + Hold. if you are looking through the viewfinder and the digital metering & shooting info goes dark. the default version of AE Lock only locks until you take a shot (or until you let the camera metering system switch off (e.g. You can lock the metering by pressing the AE Lock button (by default it's the asterisk on the back of the camera but it can be re-assigned) and if you do this, THEN the metering will lock in and re-composing the shot will not update the exposure. If you are not seeing it update the metering continuously as you half-press the button and move the camera to areas with different lighting, then something has been changed on your camera.
A Canon EOS camera will (by default) continously update the metering as you continue to hold the shutter button and move the camera. You may want to reset your camera to factory defaults. If you do not auto-ISO, the exposure comp will change.
In M, if you have auto ISO, the ISO will change with the shutter half-pressed. Press the shutter half way and hold in in P, AV, or TV and the meter is locked into that exposure. If you have any Canon DSLR you can see that you are not correct.
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