Century's 7X HD Wide Angle Converter attaches quickly to the front of your lens, offering a 30% wider angle of view and full zoom-thru capabilities. The .7X HD shifts the focal length range from 4.5-54mm to 3.1-37.8mm - with no appreciable light loss. Specially designed for HD applications with multi-layer coated glass elements. Comes in our popular Bayonet Mount that attaches with a twist to the front of your lens. Lens attachment features a front filter thread of 102mm. Schneider 102mm Clear Filter available. Part number 68-120021.