Canon EOS R5 C User Manual page 776

ISO Auto details in still photo shooting
Shooting mode
* 1: ISO 200 when [
* 2: Varies depending on [Maximum] and [Minimum] of [Auto range].
* 3: ISO 1600 when using a lens that is not compatible with "Variable control of maximum ISO Auto limit for
E-TTL".
* 4: If outside the setting range, changed to the value most close to ISO 400.
Variable control of maximum ISO Auto limit for E-TTL: Supported
ISO 100–12800
*1*2
ISO 100 –51200
*4
ISO 400
: Highlight tone priority] is set to [Enable] or [Enhanced].
No flash
*2
776
Using flash
*3
ISO 100–6400
*1*2 *2*3
ISO 100 –6400
*4
ISO 400