Possible reasons why the AF on your EF 70-200mm f/2.8 L IS II lens isn't working: The AF/MF switch is set to MF (manual focus).; You are attempting to focus an object at a distance from the camera, as measured from the focal plane mark on the camera body, that is less than the MFD (minimum focus distance) of the lens or is less than the distance limited by the Focus Limiter switch.
You could try a drop or two of isopropyl alcohol on the button and then press it repeatedly. I had an xpro1 that had a mfn button that was stuck and wouldn't press and it was loosened up with just a few drops and repeated pressing. -- hide signature --. Accelerating Entropy.
Canon EOS R7 review. The Canon EOS R7 is a 32.5MP APS-C mirrorless camera built around Canon's RF mount. It sits as a more expensive sister model to the EOS R10, launched alongside it. It's targeted at a similar enthusiast photographer market as the existing EOS 90D DSLR and, perhaps, the EOS M6 II.
(7D mk. II, EOS R, 5D mk. IV, 5Ds [R] 1DX, 1Dx Mk. II) Some of these cameras, support saving an entire autofocus configuration, not just a point. This includes the AF start position (normal or registered AF point), AI Servo AF characteristics, AF mode (one shot or servo), and area selection mode (e.g. whole area, partial area).Learn the way around the auto focus live view face recognition feature in live view mode on the 5D. http://www.elitevideo.com I am a 5D Mark III user, and make frequent use of the spot-AF mode as you describe. To switch between AF modes on the 5D Mark III the first thing is: DO NOT BE IN AUTO MODE (The green one on the dial). This will automatically select all 61 points as potential AF points and you can't change it. Use P/Av/Tv or M mode. DYUiia.