The F-number of a photographic lens is a measure of its light-gathering ability, and is expressed as its aperture diameter ...

F-stop is a consistent way to measure lens aperture, and helps photographers control exposure and depth of field. It is noted with an f followed by a slash and number, for example f/2.8. Lower ...

"Fast lenses" are highly prized, but what is a fast lens – and why is it is something that most photographers and ...

The Viltrox AF 50mm f/2 Air aims for a compact and lightweight build at a budget price, without sacrificing performance ...