唔知你唔明啲乜~~~~
比較唔同sensor, 都係用equivalent架啦
即係你想影一張相你用
1. 50mm f/2.8 I ...
goshigoo 發表於 2020-7-8 11:13 
因為師兄似系focus on "f-stop"去講等效，所以我就問幅圖想代表住...
focal length 等效當然系correct，無咩人會搞錯
但M43的ISO200 表現差到要等同FF的ISO800 我就吾甘講
低ISO我無刻意比較過，但片幅之間應該吾會差好遠
Tony 條片6:00個d point 會好易產生misunderstanding
他成個test應該系想帶出 "等效景深/DOF"
(張相一模一樣時，不同CMOS 大小之間的setting) (只提focal length和f-stop就ok，同ISO無咩關係)
尼個concept ok:
FF + 200mm @ f5.6
M43 + 100mm @ f2.8
但ISO 個part 有D confusing (系因為要same shutter speed，所以要拉高FF的ISO)
但要"等效景深/DOF" 無必要same shutter speed，可以same ISO
所以下面有個comment got many thumbs-up:
So in short, just so people don't misunderstand this - you're actually talking about the the effective DoF, not the actual amount of light coming through the lens. Logically, an f/2.8 on a full-frame is still a f/2.8 on a m43-camera, however the effective depth of field is equivalent of a f/5.6. This has to do with the size of the sensor, as you very well explained.
Great explanation, just some bits and pieces that could've been misunderstood.
Tony有D片都講錯野，吾好信灑
但今次尼個test ok，只系他表達得吾清晰，將shutter speed和ISO 混埋一齊來講 |
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發表於 2020-7-8 11:46
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