EOS R5 Mark II How to make "AE lock with hold" persist through picture playback?

[tedthom]

Hello everyone!

I already posted this question in another forum, where the conclusion was that what I wanted to do is not quite possible, hence posting on the official forum here, in case someone knows of a way to do so, just in case.

As I was setting up custom button functions in order to use the "AE lock with hold" functionality on an EOS R5 Mark II, I ran into an issue.

I am able to get the "AE lock with hold" work properly, doing the following:

- I mapped the "*" button to enable "AE lock (hold)"
- I mapped the shutter button for metering start only (effectively, I am using back-button focusing, not that it matters much here)
- I set the camera auto power off to "disabled" (so the AE lock does not get cleared by this timing out)

With the settings above, I am able to have the "AE lock with hold" functionality work the way I want: it holds the exposure forever once I press the "*" button. EXCEPT, for one thing: when I want to review my pictures, I press the "Play" button, review pictures and press the "Play" button again to go back in shooting mode. Doing so cancels the "AE lock with hold" and I have to "AE lock" the exposure again, which, in my opinion, defeats at least part of the "AE lock with hold" purpose. Going a little further, the same behavior happens if I just press the "M-fn" button, not changing anything, and when going back to shooting, the AE lock hold is gone.

To summarize: does anyone know how to make the "AE lock with hold" persist through picture playback? Not sure if I am doing something wrong.

More context on my use case: it is pretty much exactly what is described here: https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/How-to-Use-AE-Lock-With-Hold/m-p/4989...

Thank you!

[p4pictures]

I understand the question, and can replicate your observed behaviours of the AE-lock with hold function. There appears to be no way to have the lock stay “locked” when you play back images.

I have also found that AE-lock with hold is released when I use the back button to recall registered shooting functions.

[tedthom]

Thank you for taking the time to respond and confirming what you see/have.

[p4pictures]

The only way to get that level of persistence you seek is to use manual exposure. This could be either using manual mode, or Fv mode. With Fv mode, you can automatically expose, but once the values are known, you can then switch them to the manual values, and with most cameras it's pretty simple to have a button to reset all or a single item back to auto as needed. 

[Waddizzle]

Shoot in M mode.  Do not allow me camera to adjust any exposure settings, including WB. 

[tedthom]

Responding to the two last comments in one.

Thank you both for the suggestions.

- I will need to explore the Fv mode, I am pretty new to it and haven't tested it in the field, really, to adapt my workflow.

- Yes, M is the alternative, agreed. The main reason I like locking the exposure is in Tv mode, it allows me to change the shutter speed and let the camera adjust the aperture automatically (assuming manual ISO), while keeping the locked, allegedly good, exposure.