Overview / Rarity / Cultural Background This is a vintage Komura 300mm f/5 telephoto lens supplied with the Uni Helical Focusing Unit II, manufactured by Sankyo Koki under the Komura brand. The Uni Helical system allowed photographers to use a single focusing mount with interchangeable Komura lenses, offering remarkable versatility long before modern modular lens systems became common. The 300mm f/5 was appreciated for its solid construction, sharp optical performance, and relatively compact design for a telephoto lens of its era. Well-preserved examples complete with the original Uni Helical Focusing Unit II are becoming increasingly difficult to find, particularly outside Japan. Compared with telephoto lenses from manufacturers such as Carl Zeiss, Komura lenses are admired for their innovative interchangeable-mount design and the craftsmanship of Japan's independent optical industry. This lens represents the ingenuity of Japanese lens makers during the 1960s and 1970s, when innovative optical engineering helped establish Japan as a global leader in photographic equipment. Serial S203978 / 414353 Appearance Minor scratches and stains from use. Optics There is no fog. There is no fungus. There is no balsam separation. There are small scratches on the front element. There are no large dusts. No problem in the shooting. Functional It has been confirmed to work properly. The aperture blades move smoothly. The aperture operates properly. The helicoid operates smoothly. Bundled Items All you can see on the picture will be included in a set of a package. Shipping I ship it in Japan post Small Parquet. Attach the tracking number. Shipping is only available to the address registered in Catawiki. As it is shipped from Japan, it cannot be shipped to Russia. Payment We will ship the item 3 business days after your payment clears. International Buyers - Please Note: This item will be shipped from Japan. Import duties taxes and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.