[eddie1025]

請各位高手相助~
小弟早前買左一部DSLR canon 450d kit set
今日度尺時候...影低個單位d相...
四邊d牆都係白色...由於我係新手...
so 我用左 P mode 及AF去影...
但發覺按半下快門不能夠自動對焦...one shot and ai focus都影唔到
加上,我嘗試全按快門...但都係影唔到...
我試過用ai servo就好d...可以影到相...但好模糊(冇晒對焦)
跟住再試下對焦其他物件又可以影到...及MF都可以影到
是否鏡頭或部機有事
各位高手請幫幫小弟解煩惱...

[t-wing]

白色牆咩野都冇係好難自動對焦架, 一係在相同距離搵野(例如地腳線)對到焦再移到牆上面影, 一係就試用手動對焦. 影靜物用one shot得喇.

[JSmith]

冇或者好低contrast(e.g.淨色牆身)係對唔倒焦，影其他嘢冇事即係部機冇事啦

[Obi-Wan]

"eddie1025"
u used lifeview mode?

[eddie1025]

thx 各位~我試下手動對焦啦...
but 仲有一個小小既問題...
係唔係白色同全黑色都係難對焦架...
同埋我尋晚試過對住部電視機都係對唔焦...???

[eddie1025]

thx t wing and j smith
唔係用live view 架
我想問下obi wan 兄有咩大分別用live view or not

[JSmith]

自動對焦係倚靠物體contrast，所以一切低contrast既嘢都好難AF或者根本唔work。
低contrast既情況有淨色、冇花紋、冇凹凸表面物件、平面、光線不足、強光入鏡

[pongyee]

>> 係唔係白色同全黑色都係難對焦架...

全部乜色都對唔到。

[eddie1025]

thx smith 兄and pongyee!!!

[Obi-Wan]

eddie1025

if using liveview & use contrast focusing, will have some focusing issue, e.g. can't autofocus, slow autofocus etc.

[eddie1025]

obi wan

thx a lot