[jsklee]

I mean which m4/3 camera is the best in terms of its 追蹤對焦 function? If I am taking photos with a moving kid, can the camera automatically detect the moving subject and lock its movement with fast and accurate autofucus? Which one is the best? Thank you for your advice in advance!

[@ZETA@]

now GX1, later maybe E-M5....

[jsklee]

http://www.dpreview.com/articles/5118208599/hands-on-with-the-olympus-om-d-e-m5

it seems to me that the track focus of EM-5 is not good enough. See below comments from dpreview:

"With the E-M5, Olympus is reclaiming the title of 'world's fastest autofocus', from the likes of the Panasonic DMC-GX1 and Nikon 1 cameras which surpassed the E-P3. But this is notably only for static subjects - not for tracking moving objects. With fast internal-focus lenses such as the matched M.Zuiko Digital ED 12-50mm F3.5-6.3 kit zoom or the lovely M.Zuiko Digital ED 45mm F1.8 portrait lens, the E-M5's autofocus is impressively quick (although to be honest these cameras have reached a point that it's very difficult to tell a difference any more).

If you drop the continuous shooting speed to a still-pretty-rapid 4.2fps the camera will attempt to track focus during shooting, and maintains a live view feed between frames in the process: the first Olympus Micro Four Thirds camera to do so. In principle this should help track your subject when panning."

[50363415]

The G3 or GH2 can be considered for speedy focusing at 0.1s.