其实微单只需要

把时滞做的非常非常非常小，非常非常非常小，，，

把对焦最的非常非常非常快，非常非常非常快，，，

就无需追焦了。。。

对上就咔嚓，对上就咔嚓，，可以直接取消半按快门。。。。。

富士XT1，索尼A6000暗光拉风箱非常严重

松下GH4有-4EV的暗光对焦能力，很容易对上

厂家做宣传的广告词基本都不可信，或者说不能百分百的信，那些数据都是实验室测试的最高指标，跟实际使用的环境有很大差别。
还是等上市了同场景对比，才能信服！理论上的东西都还是收着吧！
以下内容由 feixianglyw 于 2014-2-16 19:48 补充
追焦能力不好说，单次对焦肯定是GH4最强，无论强光还是弱光！

打鸟、拍行人，快门1万张以上，俺的结论，EM1的追焦约等于无。
A6000，估计也是纸面上的参数。
电子取景，看来目前还不能谈追焦。

没有同场景下的对比  怎么知道谁的AF能力最强

理论上追焦A6000最快，
暗光对焦GH4最强，
EM1的相位好像是针对老43镜头的吧？

元宵节北京XT-1体验会参加者的试用报告来看，XT-1的对焦速度相比M43还是有明显差距。

都还没上市无法同场竞技呀。现在这广告词扯得都挺玄乎的。。。

无反相机的追焦能力一直是其弱点，最近发布的几个中高端相机似乎有很大进步。
除了E-M1，其他还没上市。从相机发布的新闻稿可以看一下厂家的说法。

E-M1： The newly developed DUAL FAST AF selects the ideal method, depending on lens type and settings: either 37-point On-Chip Phase Detection AF or 81-point Contrast Detection AF to maximize the performance of both ZUIKO and M.ZUIKO lenses. Both systems work together to significantly improve continuous autofocus tracking performance when a Micro Four Thirds lens is attached and C-AF is selected.
要点：DUAL FAST AF ，37个相位对角点，81个反差对角点。在 C-AF 模式M43镜头，两套系统可同时工作。

X-T1：EXR Processor II
o World’s fastest AF of 0.08 seconds
o Startup time of 0.5 seconds
o Shutter time lag of 0.05 seconds
o Shooting interval of 0.5 seconds
o Phase detection AF and motion predictive AF for continuous shooting up to 8 frames per second
富士似乎没有非常强调X-T1的对焦性能和相关技术，但说了世界最快的0.08秒对焦，8fps连拍时的连续AF能力。

GH4：GH4: All LUMIX G cameras use the Contrast AF for its focusing system. Compared with the Phase difference system AF, the Contrast AF boasts higher accuracy especially in shooting with a bright lens with a small F value. With a LUMIX G digital interchangeable lens capable of digital signal exchange at max. 240 fps, the focusing is stunningly quick and smooth. The Contrast AF system in the GH4 is further enhanced by Panasonic’s integration of DFD (Depth from Defocus) technology which even shortens the time to set focus. It calculates the distance to the subject by evaluating 2 images with different sharpness level while consulting the data of optical characteristics of the current lens. As a result, the GH4 achieves ultra high speed AF of approx.0.07 sec*8. This improvement benefits more as focusing distance increases. The burst speed of shooting is dramatically faster than its predecessor, the DMC-GH3, boasting high speed burst shooting at 12 fps (AFS) up to approx.40 (including RAW) / approx.100 (excluding RAW) and 7.0 fps (AFC) to capture fast moving subjects in-focus.
In addition, the stability of continuous focusing is improved by minimizing wobbling in both still and video recording. Together with the quick start-up and short release time lag, the GH4 never lets photographers miss fleeting shooting opportunities.
GH4用了很大篇幅说对焦，主要是240fps信息交换+DFD技术，0.07秒对焦，7.5fps连续对焦。

A6000：Sony Electronics’ new α6000 camera pushes the limits of mirrorless camera innovation, boasting the world’s fastest AF performance1 at just 0.06 seconds.
Even quicker than most professional DSLRs, the phenomenal autofocus speed of the α6000 camera is powered by Sony’s advanced Hybrid AF system.  The new model features a focal plane phase-detection AF sensor with an extremely wide autofocus coverage area – 179 focal points– that is teamed with high-precision contrast-detection AF.  This potent combination allows the camera to accurately track and respond to a subject moving through nearly the entire frame, and to shoot at an eye-popping speed of up to 11 frames per second with continuous autofocus.  It’s an unprecedented combination of speed and frame coverage in today’s market.
A6000把高速对焦作为主要卖点，声称可以目前市场上对焦能力最好的DSLR相匹敌。