singlelens

Singlelens refers to an imaging system that forms an image using a single optical element or a single lens assembly treated as one unit. It contrasts with multi-element or zoom lenses that combine several groups to correct aberrations or vary focal length. A singlelens setup may be fixed-focus or employ a simple adjustable focus, delivering a single field of view.

Historically, early cameras and optical instruments often used singlelens designs before complex multi-element lenses became standard. In consumer photography, fixed-lens compact cameras and various educational or specialized devices rely on a single primary lens or a small fixed lens group. Modern examples include some endoscopes and fixed-lens surveillance cameras where size and cost are critical.

Performance is governed by the single lens and its coatings. Correcting spherical aberration, chromatic dispersion, and other aberrations is more difficult with one element, so singlelens designs tend toward shorter focal lengths, larger depth of field, or compact form. Focusing is achieved by moving the lens or sensor, or by fixed focus with a preset distance.

Advantages include low cost, small size, light weight, and simple manufacture. Limitations include limited flexibility, potential image-quality compromises, and reduced versatility compared with zoom or interchangeable lenses. Applications include educational kits, simple consumer cameras, fixed-lens surveillance, and compact imaging devices where simplicity and affordability matter.

Related topics include lens, fixed-focus camera, prime lens, endoscope, and fixed-lens imaging systems.