Serious BUG in my new R5. Unlike all my previous bodies (5DSR, 5D Mark IV, 7D Mark II) the built-in intervalometer DOES NOT TRIGGER the shutter, when the camera is set for Back-Button Focus. That is - Shutter Button Half-Press is set to "Metering Start".
The back LED actually looks like it's taking pictures - but it's not. You see "TIMER" flashing every "N" seconds, but all it's really doing is metering once every N seconds.
If I disable Back-Button Focus (set Shutter Button Half-Press to "Metering and AF Start") then the intervalometer works as expected. But like most serious photographers, I always have my Canon bodies configured for Back-Button Focus full time.
I just wasted 2 hours thinking I was "shooting" a timelapse, but all it captured was the first image. Canon - PLEASE FIX THIS ASAP!
UPDATE: this bug (Intervalometer doesn't take any pictures, when "back-button-focus" is enabled) appears to be FIXED in firmware update 1.2.0, released on 11/19/2020.
I just installed this firmware on my R5, and did some quick timelapse testing with the built-in Intervalometer. It appears to be working properly now.
12/05/2023: New firmware updates are available.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.