Sigma is now one of the very few imaging manufacturers whose products are solely made in Japan. This gives us full control over our production processes and helps us maintain the highest levels of quality control over the design, manufacture and construction of every product. Great care is taken to ensure the highest quality materials are chosen.
All I series lenses are designed with an all-metal barrel. The precision-cut aluminium parts not only give the lens a sleek, stylish finish but provide superb durability, which improves the quality of the entire product. Metal materials are also used in internal structures that slide with the operation ring for added robustness. These high-precision components, crafted with Sigma’s cutting-edge metalworking technology, are also used in the production of the cine lens line-up for professional film-makers.
The lens has an aperture ring ① so that users can change aperture using either the lens or the camera. Great attention was paid to ensure the click is well-define but not too sharp. Sound-deadening grease has been used to create a more rounded sound and smooth action. Similarly the metal focus ring is perfectly weighted for a precise and smooth action to ensure accurate manual focus control. The ‘knurling’ grooves cut into both rings improve slip resistance ②.
As on the I series 35mm F2 DG DN, the cover ring between the focus ring and the aperture ring has brushed metal effect similar to the finish on the rear cylinder of the Art lens line. This functions as a finger grip when attaching or detaching the lens ③.