Shop › Voigtlander 90mm f/2.8 AIS Mount SL-IIS (Silver) Voigtlander 90mm f/2.8 AIS Mount SL-IIS (Silver) $549.00 sold out Voigtlander 90mm f/2.8 AIS Mount — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm. Apo-Skopar. Sold Out Added! Voigtlander 90mm f/2.8 AIS Mount — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm. Apo-Skopar.