Raynox DCR-1850, Pro 1.85x Black Telephoto Lens for Digital Still Cameras, 52mm Mounting Thread. Magnification Nominal 1.85X Actual 1.85X/Diagonal,1.85X/Horizontal Lens construction 3G/3E, made of optical glass lenses, all surfaces fully coated. Mounting threads 52mm Size/Weight 85 x 58mm/265g