EOS R5 Mark II: BBF and AE Lock

[thegios]

I have triple BBF configured

- SHUTTER: Metering Start
- AF-ON: Metering and AF Start
- *: Metering and AF Start but with subject detecnion OFF
- FOCUS POINT SELECTION: Af with eye control

How do I lock exposure now?

I am asking because people keep on telling me that by half pressing shutter the exposure is supposed to be locked, but this is not the case in any metering mode and/or shooting mode and/or focusing mode.
Thx

[p4pictures]

AE lock after focus is a setting that applies when you are using one shot AF NOT servo AF. With one shot AF the camera focuses and then locks focus and exposure. This is so that if the camera was focused on a light subject, the evaluative metering would be biased to the focused subject and locked once focus was complete. You could then recompose with locked AF and metering. 

When using servo AF there is no focus lock, it just keeps on tracking the subject up until the point the shutter is pressed. As such there is no automatic exposure lock regardless of the metering method chosen - evaluative, partial, spot or centre weighted. 

If you are using manual exposure and you have set the shutter speed, aperture AND ISO to specific values, they are the ones that will be used. You may see the camera moving the exposure compensation / metering indicator to show how different your exposure is to the one the camera is still metering for, but not setting. If you use manual with fixed shutter speed, aperture but AUTO ISO then the metering will constantly adjust the ISO up until you take the photo as effectively you have made manual mode work as an automatic exposure mode. 

You can choose to assign the AE lock with hold function to many of the buttons on your camera. Since you are currently using the AF-ON and asterisk "star" buttons for focus settings, you might want to consider using the depth of field preview button as the AE lock with hold button. 

[KFSC307]

Yeah, I gathered as much about the servo mode, but even with that turned off, I see the meter moving around when I move the locked focus point. I guess from my perspective, I am not sure I like having the meter move around after I lock focus. It drove me nuts at first, although I have gotten used to the quirks. I am aware that auto iso pretty much keeps things in the creamy 18% middle of the meter. 

I would just as soon push my back-button focus AF On. lock focus, lock exposure, then recompose, then activate the shutter button. From one perspective, it makes sense to me, although I could make a philosophical argument that being able to compare the other areas to the locked area, is helpful. I am just not sure in what way.