Zeiss Milvus 50mm f/1.4 ZF.2 Lens for Nikon F F Mount Lens/FX Format Aperture Range: f/1.4 to f/16 4 Anomalous Partial Dispersion Elements 1 Aspherical Element Distagon Optical Design Zeiss T* Anti-Reflective Coating Manual Focus Design Manual Aperture Ring Can Be De-Clicked Anodized Metal Barrel, Rubber Focus Ring Weather-Sealed Construction