A popular modular lens extension for use with popular zoom lenses including the nikon 12 24mm and canon 10 22mm the extension threads onto the base of either the modular 8 inch dome or the modular glass flat front for simple assembly and use in a wide variety of applications accommodates lenses up to 4125 inch 105 cm long and 33 inch 84 cm in diameter when used with the modular 8 inch dome accommodates lenses up to 4 inch 102 cm long when used with the modular glass flat front mea