HOYA UV-IR filters. These are specialized filters that cut BOTH UV rays below 390nm and IR rays above 700nm. This is important because the visible spectrum is between 400-700nm. Basically UV rays and IR rays both can diminish image clarity and sharpness. But by blocking them both before they get to the image sensor there is a noticeable increase in image quality.

HOYA UV-IR filters. These are specialized filters that cut BOTH UV rays below 390nm and IR rays above 700nm. This is important because the visible spectrum is between 400-700nm. Basically UV rays and IR rays both can diminish image clarity and sharpness. But by blocking them both before they get to the image sensor there is a noticeable increase in image quality.

This specialized Hoya 77mm HMC UV-IR Multi-Coated Filter has the ability to cut out both UV rays below 390nm and IR rays above 700nm leaving just the light rays in the visible spectrum passing through the filters and into the camera. This is important because CCD and CMOS sensors are extremely susceptible to UV and IR rays just outside the visible spectrum that have a very negative impact on image quality. The Hoya UV & IR Cut filter blocks both UV rays and IR rays yielding clearer and sharper pictures outdoors. This filter can reduce the effects of atmospheric haze to an even greater degree than a standard UV filter. In addition, this filter is multi-coated, which greatly reduces lens flare and ghosting, and the slim frame helps avoid vignetting on super wide angle lenses. And of... Less