<p>The <b>Hoya NXT Plus UV Filter</b> is a multi-purpose filter that is most commonly used to <b>protect the front of your lens</b>, a first line of defense against scratches, rain, dirt and dust. Hoya's NXT Plus UV is a powerful upgrade to the best-selling NXT series. This filter applies a <b>waterproof top coat</b> to <b>Schott B270 glass</b> polished smooth for maximum sharpness. There are two advantages to having a premium waterproof coating: (1) Water beads-up quickly, and easily slides off the surface of the filter for streak-free shooting. (2) It also makes the filter a lot easier to clean when dirt, water, and smudges make their way onto the surface.</p> <p> Hoya applies 10 layers of patented <b>anti-reflection (AR) HMC multi-coatings</b> to the NXT Plus UV filter for improved contrast, color, and sharpness. The coatings deliver a <b>98% light transmission</b> so you don't have to worry about contrast-killing glare. The NXT Plus filter frames are precision milled from lightweight aluminum for a <b>slim profile</b> that makes it perfect for all lenses including super wide-angles.</p> <p><b>What else does a UV filter do?</b><br> Most photographers leave a UV filter attached to the lens all the time as a <b>form of protection</b>. But the filter also plays an important role in <b>filtering through UV Haze</b>. Haze is not a huge problem when you are taking pictures at sea-level, but as you hike into higher altitudes, the filter definitely helps cut through the haze to <b>increase contrast</b> and <b>improve color</b>. The NXT plus has a <b>UV Cut Point</b> of <b>360nm</b> or <b>L36</b> which is superior to most filters at this price point.</p> <p><b>Key Features:</b></p> • Waterproof top coat for easy cleaning<br> • Schott B270 clear glass<br> • 10-layers of HMC multi-coatings<br> • 98% transmission rate for sharp, clear images<br> • Low-profile aluminum frame<p>