Shop › Voigtlander 40mm f/2.8 Aspherical LTM (Silver) Voigtlander 40mm f/2.8 Aspherical LTM (Silver) $425.00 sold out Voigtlander 40mm f/2.8 Aspherical — a manual-focus lens for Leica Thread Mount (LTM). Filter thread: 34mm. Heliar. Sold Out Added! Voigtlander 40mm f/2.8 Aspherical — a manual-focus lens for Leica Thread Mount (LTM). Filter thread: 34mm. Heliar.