UV filters are most commonly used to protect the front of your lens. A first line of defense against scratches, rain, dirt and dust. Hoyas NXT Plus UV is a powerful upgrade to the best-selling NXT series. The filters are available in sizes from 37mm to 82mm and work with most camera lenses new and old. Hoya applies 10 layers of patented anti-reflection (AR) HMC multi-coatings to the NXT Plus UV filter for improved contrast, color, and sharpness. The coatings deliver a 98% light transmission so you dont have to worry about contrast killing glare. Leaving the filter on all the time will not hurt your images and it will be your first line of defense against lens damage caused by impact, projectiles, and grimy little fingers. The NXT Plus filter frames are precision milled from lightweight aluminum for a slim profile that makes it perfect for all lenses including super wide-angles. The frame sports full front filter threads that can accept a normal lens cap or allows you to stack additional filters like a circular polarizer or neutral density.