EOS 5D Mark IV
- Feb 25, 2015
If I recall correctly, there's a 30s or 60s time-out when using the menus. A better test is using the IS switch in the lens, that should disable both IS and IBIS.The lens definitely keeps making the same whirring sound when I go into menus. No discernible change (at least to my ears) when going in and out of menus.
It does stop making the sound when the camera goes to sleep, or when I switch it off.