Amazon.com : Haoge LH-ZV05 Round Metal Lens Hood for Carl Zeiss Biogon T 2/35 35mm f2 ZM, C Biogon T 2.8/35 35mm f2.8 ZM, Planar T 2/50 50mm f2 ZM; Voigtlander NOKTON
Amazon.com : ZEISS Ikon Biogon T* ZM 2/35 Wide-Angle Camera Lens for Leica M-Mount Rangefinder Cameras : Digital Slr Camera Lenses : Electronics
Carl Zeiss 35mm f/2.8 ZM tested on the Leica M10-P and M6 TTL - YouTube
The Zeiss ZM 35 Biogon f/2 Lens review | Steve Huff Photo