Used Nikon Nikkor 50mm f/2 AI lens. Vintage from 1974-1979. Compact and quaint, this is a classic 50mm lens that’s fun for film or pairing with digital cameras. Lens is clean, glass is free of haze, fugus, oil and scratches. There is a small speck behind the front glass element, nothing that will show up on your images. Small lens with some heft.
Can be used on all F mount cameras, though you will be in complete manual metering with D3000 and D5000 series. Works on film cameras.