[捕手1號]

如果部機係無optical view finder 嘅話，塊反光片根本不用分流部分光線去optical view finder ，做乜仲留係部機入面呢﹖

﹝為咗個名好聽D﹖﹞

直情可以拆埋佢，變回無反光片但可換鏡頭嘅機，咪又係一樣﹖

玩邊科呢﹖

[waving_odd]

It's for phase detection AF sensor...

http://a.img-dpreview.com/reviews/sonyslta55/images/pelliclemirror.jpg

"...it allows 70% of the light that strikes it straight through to the 16.2MP CMOS imaging sensor. The remaining 30% is reflected upwards to a large 15-point phase detection AF array..."

[waving_odd]

fyi, EVIL systems are now on contrast detection AF which is generally slower than phase-based AF...

[捕手1號]

唔該waving_odd 師兄。