2.5mm Ultra-thin 49-77mm Step Up Ring, Rangers Aluminium Adapter Ring for Canon, Nikon, Pentax, Sony, Leica, Fuji, Lumix, Olympus Machined from a high grade aluminum alloy. Allows you to use all your filters on the same lens. Makes it possible to carry less camera equipment when you are out shooting. Extremely lightweight and durable. Please verify your lens thread size before ordering. It will be marked somewhere on your lens barrel preceded by a "" (diameter) symbol. For example: 52 = 52mm lens thread size.