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.
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 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.
What f-stop did you use for this shot?
Casual conversation between photographers.
This lens has a constant f/2.8 aperture.
Describing a zoom lens with constant maximum aperture.
Set the aperture value to f/8.
絞りを開けると、背景がぼけます。
When you open up the aperture, the background blurs.
The smaller the f-stop number, the brighter the lens.
Stopping down the aperture increases the depth of field.