Made of optical glass, Cuts light reaching sensor by 2-8 stops.

Screws on like a regular lens filter. Do away with static ND filters and change density as the light changes. Focusing is much easier with a Variable ND then with a traditional ND filter. Rotate the VND to min and focus, turn it up to desired ND effect and take the shot – much easier than taking a filter out and putting it on again.No need to buy multiple ND filters and carry them around in your gear bag. Cost-effective, practical and very convenient. Neutral density filters offer you some exciting possibilities for creating images that would ordinarily not be possible. Very useful for landscape photography and outdoor video shooting. Enjoy blurred or motion images. Variable ND allows you to slow down exposure and "capture" the motion of flowing water or speeding cars, birds or athletes, to decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background

Use cine and video cameras (which have fixed shutter speeds) to film subjects in bright scenes (snow, sand).

Fits 67 mm lens of DSLR camera/ digital camera/ camcorder DV.

Specifications: Material: Optical Glass Neutral density grade: 2-400 Back thread diameter (attach to lens, male thread): 67mm