CamDive Wide Angle Wet Correctional Dome Port Lens for Underwater Housings (67mm Round Adapter) Neoprene thickness is 3mm, which is ideal for protecting your wide angle correctional dome port lens from scratches. 67mm thread on the wide angle correctional dome port lens ensures an ease of access and mobility when most needed. Amplification co-eficient: X0.7(Underwater),The design of optical glass and antireflective coating-film makes the image perfect without distortion. High quality world class standard. Manufactory certificated: ISO9001 and CES and IPx*8. Equipped with M67 thread.