Heliopan 58mm Slim Circular Polarizer Filter (705880) 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><li><span class="a-list-item"> For brilliant color reproduction， best contrast and sharpness Heliopan offers the highest quality optical glass from the German Schott Group. </span></li><li><span class="a-list-item"> High quality hard coating on each filter side to reduce stray light， to maintain high contrast and avoid flare </span></li><li><span class="a-list-item"> Slim mount does not vignette with 21mm lenses. </span></li><li><span class="a-list-item"> Minimal reflections because of matte black anodized brass filter rims which will not bind when threaded in combination with other metals. </span></li><li><span class="a-list-item"> Limited Lifetime Warranty </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31tgoAkGSEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ADUTRcikL.jpg" noproxy>