hugo-site-uniu/content/posts/如何理解光圈.md
2025-02-10 23:52:47 +08:00

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date = '2024-12-25T23:26:48+08:00'
draft = true
title = '如何理解不同的光圈值对成像亮度的影响'
categories = ["摄影"]
tags = ["摄影理论", "镜头", "光圈", "曝光"]
+++
光圈最原始的功能是调节镜头的进光量,进而影响成像画面的亮度。这很容易引发疑问——为什么不同焦距的镜头在同一光圈值会形成基本一致的画面亮度呢?难以理解的点主要在于不同焦距的镜头在同一光圈值下往往具有不同的入射光瞳直径,给人“大眼睛”进光量更大的感觉。
`光圈值f = 镜头焦距 / 入射光瞳直径`