Lensbaby The Composer for Canon EF mount Digital SLR Cameras (Discontinued by Manufacturer) Slective focus lens, based on a ball and socket configuration, delivers smooth selective focus photography with unparalleled ease of use and greater precision Features the Lensbaby Optic Swap System Magnetically suspended disk aperture system allows f/2.0, f/2.8, f/4, f/5.6, f/8.0, f/11, f/16, f/22 aperture settings. All aperture settings included. 37 mm threads allow you to attach Lensbaby Macro Kit lenses, wide angle and telephoto conversion lenses, and other filters and accessories Note: a Lensbaby does not communicate electronically with your camera body