焦しょう点てん距きょ離り

noun

focal length

Technical term used in optics and photography to describe the distance from the lens to the focal point.

• このレンズの焦しょう点てん距きょ離りは50ミリです。

  The focal length of this lens is 50 mm.

• 焦しょう点てん距きょ離りが長ながいほど、被ひ写しゃ体たいを大おおきく写うつせます。

  The longer the focal length, the larger the subject appears.