52mm ND (neutral density) filter. You're a photo pro so definitely this is what you want. But if you're new to photography, you're probably asking yourself why would I need this? Basically filters allow you to control light conditions. Let's say you want to drop your shutter speed to create a blurring effect. But you know if you do that, you're inviting a lot of light into your camera. Well, the answer is an ND filter which prevents much of the light coming in, but doesn't impair the quality of the photo. That's what this product does, but there's more. It allows you to adjust the filter based on your own criteria. Different situations, different effects require different filtering and this inexpensive device does that for you. <br />Type: Fader ND<br />Rotating: Yes<br />Materials: optical glass<br />Back thread diameter: 52mm (Attach to lens)<br />Can adjust ND freely from ND2 to ND400<br />Carry only a single filter with the same capability with ND2, ND4, ND8, ND16, ND32... and ND400<br />Can rotate it to change 1-18 stops<br />The filter is indexed so you know how many stops of ND you are getting exactly.<br />Screw on like other filters<br />Don’t need to change filters constantly. As the light changes, just dial in another grade of filtration.<br />Be used when needing slow shutter speed under strong sunlight<br />Large aperture, can create depth of field easily<br />1 X Fader ND Filter<br />In original package<br /><img src="http://img6.eachbuyer.com/x4/p30/ih48_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x4/p30/ih48_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x4/p30/ih48_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x4/p30/ih48_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x4/p30/ih48_5.gif" />