The barrel of the SIGMA 35mm F1.4 DG DN | Art made with a combination of aluminium and a polymer called Thermally Stable Composite, or TSC ①. This strong and light polymer has a very similar thermal expansion rate to aluminium, meaning that all parts of the barrel behave in a very similar way as the temperature changes. This ensures the best possible optical precision while keeping the weight of the lens to a minimum.
The lens has an aperture ring ② that allows aperture to be controlled via the lens, or when set to Auto, using the camera. An aperture lock switch on the lens body ④ allows the aperture ring to be locked in Auto so that it’s not accidentally knocked during shooting. A big plus for film-makers, the aperture ring can be de-clicked ③, allowing users to seamlessly adjust exposure. Also on the lens barrel is a focus mode switch ⑤ and an AFL button ⑥, which can be customised to a desired function from within the camera menu (depending on the model). The switch is ergonomically positioned to be controlled by the thumb during use.
A petal type lens hood is included in the box, which helps reduce flare and offers the lens added protection if dropped. The hood has a lock mechanism that keeps it attached securely to the lens ⑦, and its rubberised grip makes it quick and easy to attach and remove.
On top of this impressive array of features and elegant exterior, the body of the 35mm F1.4 DG DN | Art offers an exceptional level of durability that helps it withstand long-term professional use as well as individual operating parts that give a good fit to the hand. The dust and splash proof structure provides sealing on buttons and along joins between constituent parts, and there’s a rubber gasket around the mount. There’s also a water and oil repellent coating applied to the front element ensures that photographers can rely on it in any conditions.