Shop › Voigtlander 28mm f/2.8 Type L Aspherical LTM (Black) Voigtlander 28mm f/2.8 Type L Aspherical LTM (Black) $549.00 sold out Voigtlander 28mm f/2.8 Type L Aspherical — a manual-focus lens for Leica Thread Mount (LTM). Filter thread: 34mm. Sold Out Added! Voigtlander 28mm f/2.8 Type L Aspherical — a manual-focus lens for Leica Thread Mount (LTM). Filter thread: 34mm.