Xit 404 Focus & Zoom Knob Kit: Nauticam and Sea & Sea SLR Housings
The Nauticam 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.