Carl Zeiss Biogon 21mm f/2.8 T* | Contax G-Mount + 21mm External Viewfinder
The Carl Zeiss Biogon 21mm f/2.8 T* is the widest conventional lens made for the Contax G system and one of the most respected ultra-wides in 35mm photography. The Biogon design is nearly symmetrical, which is what gives it its defining trait: edge-to-edge sharpness with almost no rectilinear distortion, so straight lines stay straight at the frame edges where most ultra-wides fall apart. T* multicoating keeps flare and ghosting under control in backlit and high-contrast situations. Because the 21mm field of view exceeds the coverage of the G1 and G2 built-in viewfinder, this listing includes the dedicated Zeiss 21mm external optical viewfinder that mounts to the hot shoe. This is not an optional accessory. The lens is impractical to frame without it.