The new M-Fn bar was easily the most frustrating aspect of this camera. Although it initially seemed like a clever feature to control a number of camera functions, but it has issues. First of all, the placement is better in theory than in practice. It sits next to the viewfinder, which means you’re likely to accidentally hit it at some point. You can set it so it requires a tap to activate, which takes extra time, or for immediate activation, which increases the chances of an accidental press. I tried customizing it to control a variety of different camera functions, but regardless of what it was set to control, or how it was set to function, I found that it slowed me down and led to missed shots. Ultimately I found I was happiest with the EOS R when the M-Fn bar was disabled completely.