<p><em>&nbsp; &nbsp; &nbsp;This ProMaster 49mm Basis filter can be used to remove or control reflections, improve contrast &amp; saturation, or darken blue skies.</em></p> <p>&nbsp; &nbsp; A CPL filter is a valuable creative tool. Its quality should complement your lens by handling light well and providing a clear, sharp image to the camera&rsquo;s digital sensor of film. Polished optical glass, a special multi-coating formula, and high-grade polarizing film combine to achieve high light transmission and low light reflectivity. These features allow your lens to perform at its finest. Plus, any camera&rsquo;s auto focus system works perfectly with a&nbsp;Basis CPL.</p> <p>&nbsp; &nbsp; All ProMaster Basis filters have the same size filter thread on the front and back. So, they are compatible with your lens cap, and they can be stacked with other, same-size filters.</p> <p>&nbsp; &nbsp; Why use a CPL filter?</p> <p>&nbsp; &nbsp; A CPL is one of the most highly used filters in both still photography and videography, and with good reason. The effects of a polarizing filter are difficult or sometimes impossible to imitate in post-production software. These effects can be used to create beautiful compositions.</p> <p>&nbsp; &nbsp;A CPL can:</p> <ol> <li>Control reflections and/or reduce glare on non-metallic surfaces. I.E. water, glass, glossy paint, etc.</li> <li>Improve color saturation and contrast.</li> <li>Deepen/darken the blue color of skies.</li> <li>Reduce the appearance of atmospheric haze when photographing distant objects and landscapes.</li> </ol> <p>&nbsp; &nbsp; &nbsp;Basis filters represent a terrific value. They are optically excellent and affordable and deliver great results!</p> <p><strong>Key Features</strong>:</p> <ul> <li>High light transmission for a CPL</li> <li>Low light reflectivity</li> <li>Constructed with polished optical glass</li> <li>An excellent filter at a value price</li> </ul>