This lens adapter set screws onto the front of any lens and converts its thread size to match the thread size of other accessories such as hoods, flashes, and lens converters. It combines two complete sizeconversion systems to maximize compatibility and versatility. What's included Filter Set: size conversions 3749mm, 4952mm, 5255mm, 5558mm, 5862mm, 6267mm, 6772mm, 7277mm, 7782mm Stepdown Filter Set: 8277mm, 7772mm, 7267mm, 6762mm, 6258mm, 5855mm, 5552mm, 5249mm, 4937mm Key benefits Broad compatibility: converts lens front threads to match a wide range of accessory sizes, enabling use of common filters, hoods, flashes, and lens converters across different lenses. Flexible twoset system: a comprehensive Filter Set plus a Stepdown Set covers sizes from 37mm to 82mm, increasing the number of lenses and accessories you can pair together. Simple, reliable operation: each adapter screws securely onto the lens front for quick changes in the field. Durable, lightweight construction: aviation aluminum alloy provides strength without adding significant weight. Specifications and features Material: aviation aluminum alloy Compatibility: suitable for the front thread of most lenses and a variety of accessories Size range: converts between 37mm and 82mm thread sizes (and steps down through 37mm as listed in the Stepdown Set) Use scenarios Scenario 1: You own multiple lenses with different thread sizes. Use the Filter Set and Stepdown Set to attach common filters and accessories without swapping lenses. Scenario 2: You want to use a larger filter on a lens with a smaller front thread. Apply the appropriate stepup or stepdown adapter from the sets to fit the accessory. Scenario 3: You are traveling with limited gear but need access to hoods, flashes, or lens converters that require a specific thread size. Quickly reconfigure with the appropriate adapters to maintain workflow. Notes Designed for professional photographers and hobbyists alike, this set is intended to help you elevate your photography and achieve consistent results. The construction is solid and lightweight, suitable for regular field use.