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Fotasy 72mm to 82mm Step-Up Ring adapter the step up filter rring adapter easily screws onto the front of any 72mm lens, and converts the thread size of your lens The thread size of any other 82mm accessory (such as filters, hoods, flashes and lens converters). your camera's lens thread size will be Marked somewhere on the lens barrel. This number is always preceded by a "Ø" (Diameter) symbol. For example: 72 = 72mm lens thread size. This number can also often be found printed on the back side of your lens cap.