Nikon HN-30 Screw-On Lens HoodNikon HN 30 Screw On Lens Hood NK4617 Key Features Lens Hood (Screw In) for 200mm f 4. 0 D AF Micro Lens. Use of specifically engineered Nikon lens hoods is highly recommended. In less than ideal lighting conditions, the performance difference can be substantial. Optional Screw in lens hood for select NIKKOR lenses. By reducing the amount of non essential light falling onto the front lens element, lenses can better achieve their optimum optical