Zen Underwater DP-100 4”Glass Dome Port for Canon 8-15mm with Removable ShadeCongratulations on the purchase of your new Zen Underwater port! All Zen Underwater Portsare constructed from the finest quality optical glass that is multicoated to eliminate flare andreflections. All aluminum parts are hard anodized, making them rugged and impervious tocorrosion.Care & FeedingWe recommend removing the port o-rings from the port for travel. Don’t forget to replace theport o-rings before diving!After diving, the entire system should be soaked in fresh water to dissolve any salt crystals thatmay have accumulated. After rinsing, blot any water droplets off of the port with a soft terrytowel or chamois, and allow to air dry. Water droplets left on the lens can etch the coating indirect sunlight.When cleaning the glass, use only a microfiber cloth. Do not use any cleaning solutions!It is recommended that the port sealing o-rings be replaced annually.Installation1. Remove the grey o-ring seated directlybeneath the shade