I just discovered an interesting behavior with my new R5 related to AUTO ISO. For sake of discussion, assume I’m in Av mode (haven’t tested this behavior in other modes). Using the Quick Control Dial #2 (the thumb wheel surrounding the Mode button), the default behavior is for that control to allow adjusting ISO. But, quite by accident, I discovered that if I use that dial to set ISO to something other than AUTO and then engage metering (either with half shutter press or back button focus) then I can’t set ISO back to AUTO for some number of seconds. This is true whether or not I take a picture.
The amount of time I must wait to be able to go back to AUTO ISO (using the control dial #2) seems to be tied to tied to the time set in “metering timer” on camera (red) tab 7. However, if I go into the menu at Camera (Red) tab 2 >> ISO settings I can override this time delay and immediately put the camera back to Auto ISO.
This behavior is different than my 5D Mark IV. On that Camera, regardless of how I have the metering timer set, I can always press the ISO button and turn the appropriate thumb wheel and immediately set ISO back to AUTO.
Is anyone else experiencing this seemingly unusual behavior? Is it possibly a bug, or might I have some setting somewhere set that is causing this behavior. I'm thinking possible bug since my 5D IV doesn't behave this way.
