High Quality Content by WIKIPEDIA articles! The Panasonic Lumix DMC-G1 is the first digital mirrorless interchangeable lens camera adhering to the recently developed Micro Four Thirds System system design standard. The G1 camera is similar to the larger Four Thirds System format DSLR cameras, but replaces the complex optical path needed for the optical viewfinder with an electronic viewfinder EVF displaying a live view image directly from the sensor. Eliminating the mirror box and optical viewfinder allows for smaller and lighter camera bodies, while the less complex optical path also allows for smaller, lighter lens designs.