Hoya 52MM NXT Plus UV Water-Proof Filter with Schott B270 Glass and Low-Profile Aluminum Frame

The Hoya 52MM NXT Plus UV Filter is most commonly used to protect the front of your lens. Hoya’s NXT Plus UV is a powerful upgrade to the best-selling NXT series. The new filter applies a waterproof top coat to Schott B270 glass polished smooth for easy cleaning.
Performance
The 10 layers of Hoya’s patented anti-reflection (AR) multi-coatings allow for 98 percent light transmission, resulting a sharp, clear image. The UV property of the filter also allows you to reduce haze at higher elevations.
Construction
The NXT Plus filter frame is precision milled from lightweight aluminum for a slim profile that makes it comfortable for all lenses, including super wide angles. The frame has full-front filter threads that can accept normal lens caps or allow you to stack additional filters like a circular polarizer or neutral density.
What Else Does A UV Filter Do
Most photographers leave a UV filter attached to the lens all the time as a form of protection. But the filter also plays an important role in filtering through UV Haze. Not a huge problem when you are taking pictures at sea level but as you hike into higher altitudes the filter helps cut through the haze to increase contrast and improve color. The NXT Plus has a UV Cut Point of 360nm or L36 which is superior to most filters at this price point.