Déf

Döf is a term that does not have a single, widely accepted definition in English-language sources. In practice, it often appears as a stylized variant of the more widely used acronym DOF, which stands for depth of field in photography and optics. The form with an umlaut is not standard in technical writing and is typically used for branding, stylization, or as a fictional or locale name in creative works. Because there is no universal meaning, the interpretation of dof is highly dependent on context.

In photography and optics, the conventional term is depth of field (DOF). When dof is encountered with an umlaut, it is usually not a technical term and should be treated as nonstandard spelling unless the author explicitly defines it. If a source uses 'döf' as a proper noun, it may denote a fictional location, organization, or character created within a specific work; in such cases the meaning is defined by that work.

In some cases, dof may appear as a misrendering or typographical error for DOF. Readers should consider surrounding text to determine whether it refers to depth of field or to a distinct, context-specific concept.

See also: Depth of field (DOF).