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At the heart of the E-Clypse MAG system is an outer 6061 aluminum alloy ring that supports the silicon rubber eyecup. The eyecup is available in two diameters, 34 mm or 42 mm. Mounted inside this ring is the lens housing, constructed from brass. As well as enclosing the lens elements, this housing has precision brass threads that attach the E-Clypse MAG to the camera viewfinder.