AF Micro Nikkor 200mm f/4D IF-ED lens for Nikon DSLR cameras. This is a model of Nikon's longest focal length macro lens with a RSS clamp plate on the lens foot (not shown in the rendered view but it's there). 1920 x 1200 render size at 1000 samples.
You are missing a texture - '200mm scale uv map.png', and you need to set smooth shading on the 'focus scale plate' object. Great model tho, very nice detail. If you fix that texture ill definitely give it an upvote.