Nikon Ai AF DC-Nikkor 105mm F2D Nikon HN-20 Lens Hood Kenko Pro1D Protection Filter The lens is in very good condition and functions perfectly. There is no mold or fungus, and the fine dust on the rear of the lens is only visible with a bright LED light. The aperture is clean and operates smoothly. The built-in lens hood works well, but I found the HN-20 lens hood to be more effective.