The Panasonic 25mm f/1.4 Leica D Summilux Lens is an interchangeable bright standard lens, developed by Leica exclusively for digital SLR cameras, and follows the Four Thirds Standard. This means that the lens is also interchangeable with other manufacturers that use this format.
With an ultra-bright maximum aperture of f/1.4 and a focal length that comes closest to what the human eye sees (50mm in 35mm format terms), this lens is ideal as a general purpose lens for all shooting situations.