Translation guide
In photography, an f-stop is a measure of the aperture opening in a lens, controlling the amount of light reaching the sensor and affecting depth of field. Japanese uses the loanword F値 (efu-chi) or terms like 絞り値 (shiborichi).
The numerical value representing the aperture size, e.g., f/2.8, f/8.
The standard loanword for f-stop, widely used in photography contexts.
The f-stop of this lens is 2.8.
Changing the f-stop changes the depth of field.
Literally 'aperture value', used in camera menus and technical descriptions.
Set the aperture value to f/8.
Means 'aperture' in general; often used in combination with numbers, e.g., 絞りf/2.8.
Referring to the widest aperture a lens can achieve, often described as 'fast' or 'slow'.
Means 'maximum aperture' or 'wide-open f-stop'. Used to describe lens brightness.
The maximum aperture of this lens is f/1.4.
Literally 'bright lens', a common way to describe a lens with a large maximum aperture (low f-stop number).
The smaller the f-stop number, the brighter the lens.
The action of adjusting the aperture to a smaller opening (higher f-number).
When saying f-numbers, Japanese typically uses 'エフ' (efu) followed by the number, e.g., エフ2.8 (efu ni-ten-hachi). The slash is often omitted in speech. In writing, 'f/2.8' or 'F2.8' are both common.
Both mean f-stop or aperture value. F値 is more common in casual and technical discussions. 絞り値 is often seen in camera manuals and EXIF data. They are interchangeable in most contexts.
This lens has a constant f/2.8 aperture.
Describing a zoom lens with constant maximum aperture.
絞りを開けると、背景がぼけます。
When you open up the aperture, the background blurs.
Stopping down the aperture increases the depth of field.