The 21mm Carl Zeiss Biogon is a fixed focal length ultra wide angle lens for the Contax G system. It also has its separate hot shoe mount viewfinder  GF-21. Designed for the Contax G1 and G2 auto focus rangefinder. A bright, sharp, high quality lens. Both lens caps and original leatherette lens box included.

Carl Zeiss Contax G 21mm F2.8 Biogon lens S#8011298