Why are lenses with large maximum aperture known as fast lenses?
Lens speed refers to the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger maximum aperture (that is, a smaller minimum f-number) is called a “fast lens” because it can achieve the same exposure with a faster shutter speed. Thereof, Does zooming in change aperture? The aperture changes as […]
Why are lenses with large maximum aperture known as fast lenses? Read More »