[Hui_cy]

請問單鏡機的LIVE VIEW對焦，有多少種，哪一隻對焦最快最準(LIVE VIEW)。

[kingkonghk]

SLR liveview唔關對焦事, 一要快又準, 可考慮nikon d300+afs鏡同埋eos 1系+usm鏡

[BKK]

a300 and a350 liveview focus is the fastest. But their picture quality has to be taken into consideration.

E3, D300, 40D 450D, E510, K20D all have Liveview needing flapping of mirror.

450D contrast mode liveview take around 3 sec to focus. Very slow.

[dcpitch]

數碼相機的對焦方法有二種：
（1）Phase detecting: 數碼單鏡機用。
（2）Contrast detecting: 一般傻瓜機用。

Phase detecting快而準，因直接在光上做工夫。Contrast detecting 是在ccd接收光後的電子訊息上做工夫。

除Sony A350外，所有DSLR的LiveView都是用Contrast detecting。如果用Phase detecting，反光鏡就會短暫放下，用Phase detecting後再反上，所以LiveView會短暫漆黑一片。

Sony A350用了額外一小反射鏡（詳情請參考Sony網頁）提供影像給LiveView，所以用LiveView也可以用Phase detecting，全無窒礙。