Xit 404 Focus & Zoom Knob Kit: Aquatica SLR Housings with Handle Spacer for Canon 1Ds MkIII
An Aquatica Focus Knob gives you the perfect control you need when performing that critical focus. It also makes it easier to zoom with a wide angle lens. The Focus Knob presses onto your existing knob, vinyl tape is included to ensure a snug fit. The focus knob is constructed of durable Red plastic.