You can change your shutter speed, but the camera will increase or decrease the ISO in response to match its metering. That shouldn’t change what you see in the viewfinder. If you feel the metering is off (too light or dark), you need to change the ...
Two other things to check:- You need to be in a camera mode other than Automatic, such as Manual or Aperture Priority. - Make sure in the green custom menu page 2 that the Focus Ring is set to "Focus" not "Control"
I have the RF 70-200 2.8 Z lens and it has no problem landing on 85mm and other specific focal lengths. If this is the non-Z lens, perhaps the stiffer zoom ring makes it harder to hit specific values.
Odd, I'm using the R5m2 with both those lenses and the focus ring works as expected. My lens is set to AF as is the menu setting. I wonder if there's another menu setting that's disabling this. And just to make sure, you're using the focus ring n...
