Heliopan 37mm Circular Polarizer Filter (703741) with specialty Schott glass in floating brass ring<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Removes Reflections And Increases Color Saturation Without Affecting The Overall Color Balance </span></li><li><span class="a-list-item"> Brass Is Used To Make Most Of The Rings For The Filters And Adapter Rings. Aluminum Is Used For The Rigid Lens Hoods Like The telephoto Metal Lens Shades. For The Rubber Lens Hoods A Special Rubber Mixture Is Used </span></li><li><span class="a-list-item"> Filter Factor: Between 2.3 And 2.8 (Approx. +1.3 Stops) </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31tgoAkGSEL.jpg" noproxy>