Varifocal

A term primarily used in optics and photography, describing a lens or optical system whose focal length can be adjusted. This adjustability allows the user to change the magnification and field of view without physically changing the lens. varifocal lenses differ from zoom lenses in the precision with which they maintain focus while the focal length changes; in some usages they can be considered almost interchangeable. This adaptability is crucial in various applications, from microscopes to surveillance cameras, enhancing versatility and user control over image capture.

Varifocal meaning with examples

• The photographer used a varifocal lens to subtly alter the depth of field in the portrait. As they zoomed, the background blurred or sharpened accordingly. This allowed for artistic control, emphasizing the subject or placing them into context, providing the perfect shot.
• In security systems, varifocal cameras provide flexibility. The ability to change the focal length remotely enables adjustments to monitor a wider area or focus on a specific detail, enhancing surveillance in response to emerging events, allowing for the capture of clear images.
• The scientific research lab uses varifocal microscopes for cellular analysis. The researchers can easily zoom in on different sections of a sample without switching lenses, saving time and maintaining sample integrity, and enabling more thorough examination.
• During the movie, the cinematographer strategically employed a varifocal lens for the suspenseful scene. As the character walked through the busy street, the lens smoothly transitioned to bring the viewer’s focus to the subject, manipulating the audience’s point of view.