BabelNet

bn:00035555n

Noun Concept

Categories: Optical quantities, Science of photography, Geometrical optics, Length

focal distance focal length back focal distance Back focal length effective focal length

The distance from a lens to its focus WordNet 3.0

Definitions

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Sources

The distance from a lens to its focus WordNet 3.0 & Open English WordNet

The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. Wikipedia

Measure of how strongly an optical system converges or diverges light Wikidata

The distance at which something (e.g. a lens, mirror etc.) is in focus; in air it is the distance along the optical axis from a "principal plane" of the lens to one of the lens's focal points. Wiktionary

Distance. Wiktionary (translation)

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35 mm equivalent focal length

Vertica fokusa distanco

Konjuga fokusa distanco

заднее фокусное расстояние