Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 197)

Note
Electronic first-curtain and electronic shutter modes are available with HDR set to
[
Moving sub. ].
Setting HDR mode to [ Dynamic range ] produces RAW HDR images with the
following image quality.
• [ : HDR shooting ] set to [ Disable ]: JPEG quality
• [ : HDR shooting ] set to [ Enable ]: HEIF quality
HDR image quality in RAW+JPEG or RAW+HEIF shooting corresponds to your
specified JPEG or HEIF image quality.
Exposure simulation is not performed, even with [
: Display simulation ] set to
an option other than [ Disable ], when HDR is set to [ Moving sub. ] or [ Dynamic
range ].
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