Item Type: Wide Angle Lens Material: Aluminum Alloy and optical glass Weight: Approx.319g / 11.25oz Coating Process: Anti reflection coating blue film Lens Magnification: 0.43X Lens Construction: 2 elements in 2 groups Front Filter Diameter: 82mm / 3.23in Rear Thread Diameter ...Item Type: Wide Angle Lens Material: Aluminum Alloy and optical glass Weight: Approx.319g / 11.25oz Coating Process: Anti reflection coating blue film Lens Magnification: 0.43X Lens Construction: 2 elements in 2 groups Front Filter Diameter: 82mm / 3.23in Rear Thread Diameter: 52mm / 2.05in Applicable Lens: The front filter diameter is 52mm / 2.05in and the lens can be compatible Applicable Filter: 82mm/3.2in thread diameter filter