很多初學攝影的朋友也許已經聽過「光圈、快門和ISO」這三個名詞，但要清楚明白它們的意義和互動關係也有一定的難度，看完這篇文章，希望你也可以很有信心地運用神秘的「光圈、快門和ISO」吧！
光圈的奧秘
| 光圈 | «-大光圈 | 小光圈 -» |
|---|
| 數值(例) | f/1.4 | f/32 |
| 效果 | 景深淺
入光量多 | 景深深
入光量少 |
| | 背景模糊
突出主體
拍人像/特寫 | 全部清晰
呈現實況
拍風景/記實 |
| 現場光 | 偏暗環境下應多用(若光線足夠又要用大光圈需加上ND減光鏡)" | 光線充足下常用 |
大光圈例子
小光圈例子
快門的奧秘
| 快門 | «-慢速快門 | 高速快門 -» |
|---|
| 數值(例) | 30秒 | 1/4000秒 |
| 效果 | 拍出殘影
入光量多 | 凝固動作
入光量少 |
| 現場光 | 光線不足也可拍攝 | 光線需充足(否則要配合大光圈、高ISO或使用閃光燈)， |
慢速快門例子
高速快門例子
ISO的奧秘
| ISO感光度 | «-低ISO | 高ISO-» |
|---|
| 數值(例) | ISO100 | ISO6400 |
| 效果 | 光圈大或快門慢時避免過曝 | 光圈小，快門快時也能有正常曝光 |
| | 訊噪非常小
相片質素最高和清晰 | 訊噪很多(一般而言)
相片主體邊緣開始變模糊 |
| 現場光 | 光線充足時常用 | 光線不足時用(特別是手持相機時) |
低ISO例子
高ISO例子
看完以上的資料，對甚麼時候用「光圈、快門和ISO」應該有一個概念吧？
原文刊載自Fotobeginner 攝影入門，本篇圖文獲Fotobeginner 攝影入門 Facebook／Alex Tam授權刊登，未經許可，請勿轉載。
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