Nikon Nikkor 20mm f/3.5 AI-s Lens (Nikon F Mount) The glass is optically clear

The glass is optically clear

The film advance and rewind motor is fully operational

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There is very light separation on the edge of one of the rear groups

The flash unit works with no issues

Nikon Nikkor 20mm f/3.5 AI-s Lens (Nikon F Mount) The glass is optically clearGeneral Specifications: Manufacturer: Nikon Lens Mount: Nikon F (Pre AI, AI, AI s) Focal Length: 20mm Max., Min. Aperture: f 3. 5, f 22 Filter Thread: 52mm Focus Type: Autofocus (Screw Drive), Manual Overall Condition Good (M1 O2 C2) Mechanical: The aperture ring and focusing helicoid both rotate smoothly. Optical: The lens is mostly optically clear, with a small amount of dust, and no fungus, haze or separation. Cosmetic: This exterior of the lens is