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過焦点距離計算機

無限遠までの被写界深度を最大化するフォーカス距離を計算します。

はじめに

Hyperfocal Distance Calculator — Compute the focus distance that maximizes depth of field to infinity. Enter Focal Length, Aperture (f-number), Circle of Confusion to get an instant, accurate result.

計算式

H = f²/(N·c) + f, where f is focal length (mm), N is the f-number, and c is the circle of confusion (mm). Focusing at H keeps everything from H/2 to infinity acceptably sharp.

ステップごとの説明

  1. Enter the Focal Length.
  2. Enter the Aperture (f-number).
  3. Enter the Circle of Confusion.
  4. Click Calculate to see your result instantly.

実例

Example: With Focal Length = 50 mm, Aperture (f-number) = 8, Circle of Confusion = 0.03 mm, the Hyperfocal Distance Calculator gives Hyperfocal Mm: 10466.6667, Hyperfocal M: 10.4667.

よくある質問

What happens if I focus exactly at the hyperfocal distance?
Depth of field extends from approximately half the hyperfocal distance out to infinity, maximizing the sharp zone for that focal length and aperture.
Why does a wider lens have a shorter hyperfocal distance?
Hyperfocal distance grows with the square of focal length, so short focal lengths (wide-angle lenses) produce a much smaller H than telephoto lenses at the same aperture.
What inputs does the Hyperfocal Distance Calculator need?
You'll need to provide: Focal Length, Aperture (f-number), Circle of Confusion. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Hyperfocal Distance Calculator?
The Hyperfocal Distance Calculator applies the formula exactly as calculated — H = f²/(N·c) + f, where f is focal length (mm), N is the f-number, and c is the circle of confusion (mm). Focusing at H keeps everything from H/2 to infinity acceptably sharp. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Hyperfocal Distance Calculator free to use?
Yes, the Hyperfocal Distance Calculator is completely free, requires no signup, and runs instantly in your browser.

過焦点距離計算機について

The Hyperfocal Distance Calculator uses a real, verifiable formula — H = f²/(N·c) + f, where f is focal length (mm), N is the f-number, and c is the circle of confusion (mm). Focusing at H keeps everything from H/2 to infinity acceptably sharp. — so results are accurate every time, not an approximation.