groothoek

Groothoek is a Dutch term that literally means "large angle." In everyday Dutch it is used to refer to a wide angle or a large field of view, rather than a specific mathematical angle. The word appears mainly in practical and technical contexts, particularly in photography and optics.

In photography and optics, a groothoek describes a wide-angle perspective or a wide-angle lens. A lens described as groothoek typically has a short focal length, often around 24 millimeters or less on a full-frame camera, which yields a broad view and can exaggerate perspective. Ultra-wide and fisheye lenses are closely related, offering even wider fields of view and sometimes highly distorted imagery.

In geometry and mathematics, the term may be used descriptively to denote a large angle, for example an angle greater than 90 degrees. However, in formal mathematical writing English-language terms such as obtuse angle or specific angle measures are preferred; "groothoek" is chiefly encountered in Dutch-language discussions or everyday speech.

The word is a straightforward compound of groot meaning "large" and hoek meaning "angle," and it is not widely used as a fixed technical term outside Dutch-language contexts. In Dutch-speaking markets, it may appear in product descriptions or consumer-language discussions to signal a wide field of view rather than as a precise, universally standardized term.

See also: hoek, breedhoek, wide-angle lens, focal length, field of view.