[t502kg]

好耐都冇拎支小白兔出街行, 琴日興起去行動漫, 冇帶閃, 求其見到有女就影幾張, f/2.8都sharp到

[t502kg]

[t502kg]

[t502kg]

[t502kg]

[h0001244]

Out focus on the key areas

[t502kg]

oh I'm so sorry about that!!! XDDDDDDDDD

[siusiusiusun]

咁假....

[rocky3]

鏡sharp人又sharp
拎支·1.5kg小白兔出街，都幾辛苦
但值得

[ChiuChiu1970]

"key areas" 即係邊度？唔係好明...........

[t502kg]

由於當時好多人, 長zoom埋去起碼有120mm+焦距以上, 現場室內光源不算充足, 光圈全開f/2.8打眼, 加上長焦距, 景深更淺, "key areas"又比眼睛位置離太遠, 所以out of focus!

[Ryeung02]

ChiuChiu1970兄: key areas = 事業線.

[t502kg]

個個人key area可能唔同......XDDDD

[t502kg]

(1) 以呢張為例, 事業線清晰度還算可以, bust point開始模糊!


(2) 咁我地就可以用DOF公式(120mm, f/2.8, 當時離model大概2.5m)計出bust point 離眼睛有多遠, 計出Total DOF = 0.7m, 即係model眼睛離bust point有7cm距離


(3) 咁如果估計到眼睛離背部距離 - X, 就可以計算到上圍 (Total DOF + X = 直徑......計圓周), 本人估計大概係15cm, 咁圓周就係 [(7+15)/2]*3.14=34.5cm上圍

(4) Cup size真係計唔到, 除非知埋背厚......目視唔到, 要走埋去用手度一度(除衫).......

[t502kg]

Total DOF係0.07m(7cm)先啱....打錯咗....