Amazon.com : ZEISS Ikon Biogon T* ZM 2.8/25 Wide-Angle Camera Lens for Leica M-Mount Rangefinder Cameras, Black : Camera Lenses : Electronics
Amazon.com : ZEISS Ikon Biogon T* ZM 2/35 Wide-Angle Camera Lens for Leica M-Mount Rangefinder Cameras, Black : Camera And Photography Products : Electronics
The Tenax II: Zeiss Ikon's Precision, Fast-action Camera: A PictorialCompendium and Gallery of Work: Loder, Michael Wescott: 9781389878213: Amazon.com: Books
Amazon.com : ZEISS Ikon Biogon T* ZM 2.8/25 Wide-Angle Camera Lens for Leica M-Mount Rangefinder Cameras, Black : Camera Lenses : Electronics