aviation aluminum alloy. Extremely and lightweight. 18pcs The lens adapter easily screws onto the front of any lens, and converts the thread size of your lens- to the thread size of any other accessory (such as , hoods, flashes and lens converters). Specifically designed for your camera for tight and . Filter Set---37-49mm,49-52mm,52-55mm,55-58mm,58-62mm,62-67mm,67-72mm,72-77mm,77-82mm.Step-down Filter Set---82-77mm,77-72mm,72-67mm,67-62mm,62-58mm,58-55mm,55-52mm,52-49mm,49-37mm. Designed for professional photographers and hobbyists alike, this set is perfect for anyone looking to - their photography game and achieve results-