· [ Multi-purpose ] The wide-angle dome port is a multi-purpose dome port designed for wide-angle fisheye lenses, can be installed in various types of SLR or micro-series waterproof housing, 110mm spherical diameter makes it excellent edge image quality, is the best choice for image quality users. · [ Waterproof ] This product O-rings to maintain its waterproof performance. · [ High Strength ] 130FT / 40m underwater photography-This product is made of a high-strength shell, and is firmly fastened and waterproof, and can be used under 130ft / 40m underwater. Very suitable for extreme sports, such as surfing, diving, snorkeling, and rafting. · [ Anti-reflective ] Plus anti-reflective coating design, so that the quality of the perfect performance without distortion. · [ Warn ] Only for cameras with microspur.