Features:<br /><br />Material: Optical Glass<br /><br />Back thread diameter (attach to lens， male thread): 52mm<br /><br />Front thread diameter (attach additional filter， female thread): 55mm<br /><br />This Lightdow Fader ND Filter is adjustable from ND2， ND4， ND8… to ND400 Infinitely， satisfied different shooting conditions. And with 52mm male thread/ 55mm female thread can be mounted to 52mm lens or attached to 55mm additional filter. Compact size for convenient to carry， ideal for famous photographers， film directors or other photography hobby<br /><br />PMC: Zhen Zhen digital multi-multi-coated filters greatly add membrane treatment to reduce flare and ghosting caused by reflections present adverse effects<br />BAF: black tone frame， matte black filter function<br />Galaxy: a frame of black glass， these filters are equipped with black rimmed glass to reduce the chance of the edge lights<br />LPF: low-frame ultrafiltration frame to help avoid ultra wide-angle lens flares are designed to hold a lens cap<br />Blurred trance: roll lace frame These filters are equipped with a straight knurling edge slip.<br />Ultrasonic vibration cutting: under UV case， under the protection filters further extend the life of the filter 0.5 mm ultra-thin glass， 3 mm low-profile frame<br />Compatibility: suitable for all 52mm lens thread<br /><img src="http://img6.eachbuyer.com/x9/p100/eb5743_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb5743_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb5743_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb5743_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb5743_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb5743_6.jpg" />