Conversion ring to Nikon

42mm Screw Thread Lens to Nikon Multiple layers of antireflection coating Size of all structures and all the original camera lens mount design parameters, using a multi-layer antireflection coating (MC) technology, greatly improved the optical transmission products, through the rate of 98.5%. All products are made eliminating stray light treatment. Color balance were made by coating both sides of the design, ensuring the original lens color and sharpness.