Hoya fusion one next is an update of the hoya fusion one series and continues to benefit photographers in a variety of shooting conditions by incorporating high quality optical glass with hoya's water repellent and stain resistant super hmc coatings which make filter maintenance easy whilst providing reliable protection for the camera lens.the word one in the naming of this series is maintained as legacy of hoya pro 1d, in memory of its contribution to photographers' creativity, with the belief that this new series will serve well for many decades ahead.fusion one next filters have been designed to match the rigorous standards and optical capabilities of modern, high resolution lenses'. '.strtoupper('t')hey join the hoya filter line up as a fusion of all the highly valued specifications multi layer coating, ultra high light transmission, professional grade optical glass and a low profile filter frame'. '.strtoupper('t')hey additionally incorporate stain resistance and a water repellent coating.the protector filter is designed for constant use and is recommended for shielding your valuable lenses from expensive front element damage that could be caused by knocks, dirt or scratches.