The Sakar 103676 Camera Lens is a 49mm lens with a maximum aperture of f/2.8. The 1:2.8 designation indicates the lens can open to f/2.8 for brighter images and shallower depth of field. It is designed for use with gear that accepts a 49mm filter size, making it a straightforward option for general photography with compatible cameras or accessories that use 49mm optics.
