Teilentfernung

Teilentfernung, also known as partial distance or selective distance, refers to a concept primarily used in the context of optical systems, particularly in photography and microscopy. It describes the technique of focusing on a specific portion of an image while maintaining a certain level of sharpness across a broader area. This method is often employed to achieve a shallow depth of field, where only a small section of the scene appears in sharp focus, while the rest remains blurred.

In photography, teilentfernung is achieved through the adjustment of the camera’s aperture and focal length. A wider aperture (lower f-number) and a longer focal length lens tend to produce a shallower depth of field, allowing photographers to isolate subjects within a scene. This effect is particularly useful in portrait photography, where the subject’s face can be kept in sharp focus while the background remains artistically blurred.

In microscopy, teilentfernung is less common but can be relevant when examining thin or semi-transparent samples. By focusing on a specific layer or section of the specimen, researchers can study fine details without interference from other parts of the sample. This approach is sometimes combined with techniques like confocal microscopy to enhance clarity and depth perception.

The term itself is not widely used in English but is derived from German, where *Teil* means "part" and *Entfernung* means "distance." While the concept is rooted in optics, its application extends to other fields where selective focus or depth manipulation is beneficial. Understanding teilentfernung helps in optimizing image quality and precision in both scientific and artistic contexts.