This is a vintage Summicron 5cm Summaron 3.5cm Lens Hood from Ernst Leitz GmbH Wetzlar, designed for use with Leica cameras. It supports lenses such as the Summicron 3.5cm and 5cm. The adapter shows signs of use with light scratches and wear on the body, but it remains in good functional condition, making it a valuable piece for collectors and photographers interested in classic Leica equipment.
