https://en.m.wikipedia.org/wiki/Hyperfocal_distance
底下有說明
[Consecutive depths of field]
The hyperfocal distance has a curious property: while a lens focused atHwill hold a depth of field fromH/2 to infinity, if the lens is focused toH/2, the depth of field will extend fromH/3 toH.
簡單的說 景深前緣位置在超焦距的一半,你可以拿上面公式演算,我自己也算過了,這結?
我有看到你底下貼的表 ,我覺得那張表計算過程應該有嚴重瑕疵,或是該鏡頭因為呼吸效?
你也可以這樣解釋 不論你對焦距離S為何,無限遠的模糊程度跟S/2焦平面模糊程度一樣。