Wed like to say that the Spectrum mask from Sherwood Scuba is one of a kind.But with four completely different lenses, its simply not true. The Spectrumwas Sherwood Scubas first Mirrored and Colored Lens mask. Each unique colorprovides a different perspective above and below the surface. Mirrored andcolored lenses not only provide a new and refreshing look to a standardtempered lens, they also enhance the lens functionality. Tangine lenses aredesigned to offer optical contrast while diving. The Tangine lens drasticallyreduces light wavelength from 400-600 nanometers. This minimizes the UV lightentering the mask which reduces glare and improves optical clarity. Sunscapelenses are designed for diving where colors are vibrant. This unique lens willfilter out blue wavelengths which allow more reds, yellows, oranges, andgreens to your eyes while diving. Rubicon lenses are designed to add moreoptical contrast and make things easier to spot while diving. This lens isideal for low light levels or even night diving. Platinum lenses is designedto reduce glare from the sun while at the surface, without compromising visualacuity, while below the surface.