Shop › Voigtlander 40mm f/2.0 Metal Knurling SL-IIS Voigtlander 40mm f/2.0 Metal Knurling SL-IIS $479.00 sold out Voigtlander 40mm f/2.0 Metal Knurling — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm. AIS with black nose. Sold Out Added! Voigtlander 40mm f/2.0 Metal Knurling — a manual-focus lens for Nikon AI-S / SL-IIS. Filter thread: 52mm. AIS with black nose.