I just noticed when using both an EF 50mm 1.2L and an EF 50mm 1.0L on the EOS R that the camera actually stops down the lens while it's attempting to autofocus in moderately bright conditions. If you have the aperture set wide open, it opens back up to actually take the photo. It will even stop down the lens when you aren't trying to focus by just pointing it at a bright source of light. If you focus under pretty dim lighting, the lens doesn't stop down. This seems kind of weird. I wonder why this happens. Apparently under some conditions there's just too much light hitting the sensor for it to focus properly? I do wonder how it can possibly nail focus at a wide aperture if it's not actually at the wide aperture when it's autofocusing.