📷 超焦距计算器（焦距、光圈、弥散圆）Hyperfocal Distance Calculator (Focal Length, f-Number, CoC)

使用说明与常见问题How-to & FAQ

「超焦距计算器（焦距、光圈、弥散圆）」是什么？What is the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) tool?

H ≈ f²/(N·c) + f，其中 f 为焦距(mm)、N 为光圈系数、c 为弥散圆直径(mm)。再给出米制结果。本地处理。H ≈ f²/(N·c) + f with focal length f (mm), f-number N and circle of confusion c (mm), plus metres. Processed locally.

如何使用「超焦距计算器（焦距、光圈、弥散圆）」？How do I use the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) tool?

在「超焦距计算器（焦距、光圈、弥散圆）」中，填写「焦距 mm」、「光圈 F」、「弥散圆 mm」等参数，结果会随输入实时计算并显示在下方。In the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC): Fill in "Focal length mm", "f-number", "CoC mm"; results are recalculated instantly as you type.

弥散圆怎么选？How do I choose the CoC?

全画幅常用约 0.03 mm，APS-C 约 0.02 mm，取决于画幅与清晰度标准。Full-frame often ~0.03 mm, APS-C ~0.02 mm, depending on format and sharpness standard.

公式精确吗？Is the formula exact?

H = f²/(N·c) + f 是常用近似；有的资料省略末项 +f。H = f²/(N·c) + f is the usual form; some references drop the trailing +f.

能举个计算实例吗？Can you show a worked example?

例如在「超焦距计算器（焦距、光圈、弥散圆）」中填 焦距 mm = 50，光圈 F = 8，弥散圆 mm = 0.03，结果区显示：超焦距 mm：10,466.6667；超焦距 m：10.466667For example, entering Focal length mm = 50, f-number = 8, CoC mm = 0.03 in the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) gives: Hyperfocal mm: 10,466.6667; Hyperfocal m: 10.466667

哪些输入会被检查？Which inputs are validated?

「超焦距计算器（焦距、光圈、弥散圆）」会检查这些输入——「焦距 mm」：必须填写，须大于 0且不大于 1,000,000,000,000,000；「光圈 F」：必须填写，须大于 0且不大于 1,000,000,000,000,000；「弥散圆 mm」：必须填写，须大于 0且不大于 1,000,000,000,000,000；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) checks its inputs — "Focal length mm": required, must be more than 0 and at most 1,000,000,000,000,000; "f-number": required, must be more than 0 and at most 1,000,000,000,000,000; "CoC mm": required, must be more than 0 and at most 1,000,000,000,000,000; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「超焦距计算器（焦距、光圈、弥散圆）」的设置：「焦距 mm」默认 50；「光圈 F」默认 8；「弥散圆 mm」默认 0.03。每次生成结果都按当前设置处理。Settings in the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) — "Focal length mm" default 50; "f-number" default 8; "CoC mm" default 0.03. The result always uses the current settings.

计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?

「超焦距计算器（焦距、光圈、弥散圆）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.

「超焦距计算器（焦距、光圈、弥散圆）」免费吗？需要注册吗？Is the Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) free? Do I need an account?

「超焦距计算器（焦距、光圈、弥散圆）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Hyperfocal Distance Calculator (Focal Length, f-Number, CoC) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.