[etermity]

如果用小光圈, 影出黎既相就會係深景深效果~ right ?
對焦的目的是想把主體影得清晰, right?

問題就係依度?
e.g 如果將對焦放在model上, 但我用小光圈, 咁整張相都會清晰, 咁依個情況對焦黎 有乜用?

[genewch]

The depth of field is only an area which is relatively sharp comparing to other objects out of the DOF. The focus is always the sharpest area. Your example is like a pinhole camera. The image is fairly sharp with a small aperture, but it's still not as sharp as the focus. Blurness still happens. Moreover, a very small aperture leads to diffraction which splits different colours and decreases the image quality.

[intel875]

你唔對焦 咁你用幾細光圈(用到針孔除外) 都唔會sharp清晰
對焦係把光線集中在1點, 細光圈令所有入相機的光線變得幼左, 光線更接近集中在1點, 所以比較清晰, 所以當唔係針孔大小的光圈時, (針孔大小的光圈時, 光線變得好幼, 不雖要鏡頭, 鏡片的對焦, 都可把光線集中在1點) 還要對焦才有sharp

[jammy_2002i]

你以後咪唔好對焦影相LOR....

[dynax7d]

如果您對控制景深有信心
收細光圈再以手對對焦到特定距離, 利用細光圈深景深的特牲
便能實現無對焦的snap shot了