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The rigid Summicron joined the range in 1956 and stayed in the catalogue until 1968, sold as 11818 beside the dual-range 11918 with its close-focus attachment. The same seven element, six group optics are carried in a fixed chrome-plated brass tube, which makes it heavier and mechanically far more solid than the collapsible it followed. It takes E39 screw-in filters and the clamp-on 12585 hood, and it remains the version many collectors return to for its period rendering.