One filter that does the job of two. With the Hoya HRT Polarization filter and UV coating, you don't have to choose which phenomenon you tackle first. Do you want to avoid reflections in spectacles, glasses, windows, or water? This filter polarizes light, so you won't get reflections. Want to prevent the sun from making your photos hazy at the same time? Also not problem, as this same filter also removes ultraviolet rays. Despite the two functions, the filter is only 5mm thick, so your wide-angle shot won't be hindered in any way. With so many great properties, this filter is indispensable for landscape photographers. Actually, it's for any photographer who wants to avoid unwanted vignetting. And who doesn't?