[yourmotherboard]

我係一個新手, 請問....

如果影背光既野, 如大廈, 咁我用重點曝光, 想棟樓光D, 對住棟樓對焦, right ?

咁同

對住棟樓用曝光銷

有咩唔同 ?

many thanks,

[yourmotherboard]

sorry 重點曝光 => 重點測光 先岩

[killerdick]

基本上係一樣.....如果你對左焦之後唔移既話....
如果你想對焦後先構圖...咁你就要先對住楝樓按AE LOCK，跟住再半按快門對焦...然後再構圖...

[yourmotherboard]

哦..... 原來如此

D90 可以set 半按對焦等如曝光鎖, 咁我 set左係米就方便些 ?

其實有無咩情況, 對焦點同測光點係唔同? 因為我影親都會一樣的

thanks,

[klchan23]

Something like when your subject is not at the center. The spot meter can cover your subject.

[killerdick]

如果你係用中間果點對焦咁應該無問題....因為你對焦果陣巳經同時以對焦物件唻測光....
不過...如果你對焦物件唔等如測光物件咁就有問題囉...

[u2108453]

usually, spot metering is used for tackling objects with high contrast against the background. correct me if I'm not.

[yourmotherboard]

死喇, 越講越混亂

對焦物件 通常都等如 側光物件架啦 對不對 ?

我半按快門對住個人對焦後, 再移動構圖, 咁樣既話, 會用左背景做側光物件嗎?

[killerdick]

唔會~~!!

[yourmotherboard]

好混亂, 有無師兄可以清楚D咁講講 ?

[lokism3]

"對焦物件 通常都等如 側光物件架啦 對不對 ?" --> not always

"我半按快門對住個人對焦後, 再移動構圖, 咁樣既話, 會用左背景做側光物件嗎?" --> No, the condition is "D90 可以set 半按對焦等如曝光鎖"

In general, the camera built-in meter reading is taken on a "middle grey" object (18% grey); use the "spot" to spot the mid-grey part in your picture than lock down before re-frame, than you'll have the best exposure.

In case of portrait, human face is prefect middle grey; so the "spot" & the "focus" are always on the same point. But in the case you're taking a building, than they may not be the same point in many cases. Try & study with more shots to learn what is mid-grey, for digital, you can see the result right after press the shutter, right?