SummaryA simple zoom gear for the Olympus m.zuiko 12-50mm lens in Nauticam housing. The zoom gear allows to control zoom, but not the special macro switch. The design is based on my reconstruction of something I remember seeing in an Alex Musterd message on wetpixel. I can't find the original right now. InstructionsSimply put on the lens (from the top). The "fingers" should snagly fit the zoom ring. Be careful to ensure the zoom is in the right position (manual or power zoom). If there is not enough friction, you can tighten the fingers with a rubber band, although I don't find it necessary.