Focal length is used to determine your lens's angle of view, which is what you see when you look through your camera's viewfinder. The angle of view is measured from the point where rays of light ...

OM System has announced the breakthrough M.Zuiko Digital ED 50-200mm f/2.8 IS PRO—a fully weather sealed, all-purpose super ...

Sigma presents three new lenses for full-frame format: a superzoom and two fast Art lenses for E- and L-mount.

Manufacturers measure the focal length focused to infinity to keep a standard. Focal length is measured in millimeters. A 50mm lens will have a point of convergence of 50mm (or 5cm) from the sensor.

A lens focuses light onto the sensor of a digital camera and is critical to photography. To help you make an informed choice when buying or mounting an optic, we explain some of the most important ...

The new 20-200me from Sigma is the world’s first 10x zoom lens to begin with an ultra-wide 20mm focal length designed for ...

Canon has announced the RF 85mm F1.4 L VCM, a prime lens offering a classic portrait focal length and fast maximum aperture.

Canon has introduced the RF85mm F1.4L VCM, the first medium telephoto lens in its professional f/1.4 VCM series, in India.

Unlike camera lenses, telescopes have no iris to reduce the effective aperture, so the focal ratio is simply the focal length divided by the aperture.

Why you can trust TechRadar We spend hours testing every product or service we review, so you can be sure you're buying the best. Find out more about how we test. A lens aperture is the hole that is ...