Shop › Voigtlander 28mm f/2.8 Aspherical SL-IIS (Silver) Voigtlander 28mm f/2.8 Aspherical SL-IIS (Silver) $549.00 sold out Voigtlander 28mm f/2.8 Aspherical — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm. Sold Out Added! Voigtlander 28mm f/2.8 Aspherical — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm.