The Aqua Tech LT-TZ Sound Blimp Lens Tube for Canon 70-200mm f/2.8 is the part of the sound blimp that covers the lens. It reduces lens noise to a nearly imperceptible level, so you can use your camera with the lens in places where it is necessary to be quiet, such as on movie sets, sound stages and theaters, in certain sports venues, in courtrooms and in wildlife photography.
Lens tubes are interchangeable on the sound blimp, which is not for water use. The tubes are not compatible with Aqua Tech Sport Housings. This tube will fit the following lenses: Canon 70-200mm f/2.8 - 193.6mm long, 70-200mm f/2.8 IS - 197mm long, and 70-200mm f/2.8 IS II - 199mm long.