Canon EOS M extensive review and iso comparison to Olympus E-M5, Sony NEX-5R/NEX-6/NEX-7 and Nikon 1 J1/J2/V1 by Nasim Mansurov at Photography Life: Not very impressed, better wait and see Canon's next move.

Canon EOS M Canon EF-M 18-55mm f/3.5-5.6 IS STM and Canon EF-M 22mm f/2 STM.

"With the fancy “hybrid autofocus” name, I expected the Canon EOS M to focus very quickly before I received the camera. I thought it would be as fast as the Nikon 1 system, which is still among the fastest in terms of autofocus, especially continuous AF. Unfortunately, the EOS M is a huge disappointment in terms of AF speed, so the fancy name is just a marketing gimmick. It certainly did not live up to my expectations and this was the deal breaker for me. Autofocus speed was poor in both daylight and low light conditions, especially with the 22mm pancake lens. The camera often makes the lens

hunt for focus back and forth and only acquires focus at the very end, when it finds enough contrast. I went to the Rocky Mountain National Park for a hike on a sunny day and the despite the almost ideal conditions, the camera went back and forth trying to acquire focus in high-contrast scenes (with the 22mm pancake). The 18-55mm lens focuses a little faster, but it is still too slow. The Sony NEX-5R acquires focus faster and the Nikon 1 cameras or the Olympus OM-D E-M5 are lightning fast in comparison. So forget about trying to capture anything that moves. I don’t even know why Canon included the Servo mode in the EOS M, because it clearly cannot handle it.

As for manual focus, unlike the Nikon 1 lenses, the Canon EF-M lenses feature a manual focus ring for smoother and more precise MF operation. You can choose to have the camera only engage in autofocus, manual focus or you can do autofocus with manual focus override. Once you put the camera into manual focus mode through the menu, you can zoom in by using the touch interface. The live view does not get interpolated, which is great. Unfortunately, focus peaking feature is not available on the EOS M.
Overall, the autofocus system on the EOS M sucks, period. I don’t know if Canon can issue a firmware update to improve the AF speed, but it needs to address this as soon as possible."

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