絞しぼり値ち

noun

f-number; f-stop; focal ratio

Technical term in photography and optics for the ratio of the lens's focal length to the diameter of the entrance pupil. Used when discussing aperture settings.

• このレンズの絞しぼり値ちはF2.8からF22まで変かえられます。

  The f-number of this lens can be changed from f/2.8 to f/22.

• 絞しぼり値ちを小ちいさくすると、背はい景けいがぼけやすくなります。

  When you make the f-number smaller, the background becomes more easily blurred.