Originally designed for the cine lens market and later adapted for stills, the 40mm F1.4 is often touted as the most optically perfect lens in the entire SIGMA Art range. With incredible sharpness right across the frame at all apertures, and exceptional resolving power, this outstanding wide-standard prime is a popular choice for professional photographers who need the very best image quality money can buy. It is ideal for portraits, street, product, advertising and lifestyle photography, and also perfect for landscapes and weddings.
The optical design of the 40mm incorporates 16 elements that include 3 FLD, 3 SLD and one aspherical element. There is virtually no corner softness at any aperture, almost zero chromatic aberration or coma flare and distortion is 1% or below at infinity.
The superb build quality of the 40mm F1.4 DG HSM is exactly as you’d expect from an Art-line lens, both in its intuitive ergonomics and in the quality of craftsmanship.
The exterior barrel is made of a polycarbonate called Thermally Stable Composite (TSC). Not only is this very strong and light, but it has a similar thermal expansion rate to aluminium. This ensures that the interior aluminium parts and the exterior TSC parts behave in a uniform way as temperatures change.
The focus ring is rubberised for easier operation, and focusing is internal, meaning the lens never changes length..
To reduce flare and ghosting in bright sunlight, and to help protect the front element from damage if dropped, the lens has a robust petal-type lens hood.
The durable brass mount is surrounded by a rubber seal to help keep out dust and moisture.
Precision brass mount with seal
Protects against dust and moisture.
Made from a strong and light polycarbonate that behaves in a similar way to aluminium.
The 40mm F1.4 DG HSM | Art for DSLRs boasts outstanding optical quality, with excellent rendering of detail right into the corners even wide open at F1.4.
The lens has an advanced optical design made up of 16 elements in 12 groups, including 1 aspherical element, 3 SLD elements and 3 FLD elements. This ensures razor-sharp results with very minimal chromatic aberration, flare, distortion and vignetting.
Advanced optical coatings reduce flare and ghosting when working in bright direct sunlight, creating high-contrast images with rich colours and strong blacks.
Owing to its ultra-wide aperture of F1.4, the 40mm is at home in low-light conditions, letting in four times the amount of light as an F2.8 lens. This makes it easier to hand-hold the lens without the risk of camera shake and unwanted blur.
With the same maximum apertures, the same Art line optics and build quality and the same HSM focusing motors, the SIGMA 35mm F1.4 DG HSM | Art and the 40mm F1.4 DG HSM | Art are both superb wide-standard prime options. The 40mm is considerably heavier and larger, but many believe it to be the most optically perfect lens in the Art range of DSLR lenses.
All Sigma cameras and lenses are designed, manufactured and assembled at our sole factory at Aizu in Japan. This domestic production model is unusual in today’s industry, with most imaging companies opting to outsource to other countries to reduce costs. But SIGMA believes that keeping virtually all manufacturing, processing and assembly in Aizu is essential for creating innovative, carefully thought-out and impeccably constructed products that meet the high standards demanded by professional photographers and film-makers around the world.
Sigma chose Aizu as its main production base in the early 1970s. Situated at the base of Mount Bandai in the Fukushima Prefecture, about four hours’ drive north of Tokyo, Aizu has an abundance of very clean water from mountain streams, which is essential for grinding and polishing lenses. Sigma’s founder, Michihiro Yamaki, was also drawn to this area for its workforce, who have a reputation for their craftsmanship, work ethic and attention to detail. Mr Yamaki’s son, Kazuto Yamaki, now the owner and CEO of SIGMA Corporation, has the same unwavering commitment to keeping production in Japan.
Today Sigma’s factory is more than 50,000 square feet in size, and packed full of some of the most advanced optical manufacturing technology in existence. So when you buy a Sigma camera or lens you can be sure that virtually every single component part has been manufactured and assembled by SIGMA, in Japan, with the greatest level of care and attention. We hope you enjoy using our products.
If you want to see how a particular SIGMA lens or camera performs, why not test drive it with our SIGMA Select hire service. Available for selected SIGMA lenses, short-term loans are free of charge (including shipping), with a small fee if you want to test it for longer. Refundable deposit required. Subject to availability.
16 elements in 12 groups
Angle of view
Number of diaphragm blades
9 (rounded diaphragm)
Minimum focusing distance
Maximum magnification ratio
Dimensions (diameter x length)
ø87.8mm × 131mm
Corresponding AF mounts
Canon EF | Nikon F | Sigma SA | L-Mount | Sony E
Canon EF barcode
Nikon F barcode
Sigma SA barcode
Sony E barcode
Specifications are for SIGMA SA mount
A special coating applied to the front element to help repel water and oil.
This suppresses flare and ghosting by minimising reflections within the lens, ensuring punchy, high-contrast results. All lenses in the current Sigma range feature this technology.
Internal focus or an inner focus system means the lens configuration uses movable internal lens elements that adjust focus without changing the length of the lens barrel. This helps keep the centre of gravity of the lens more constant when changing focus.
Sigma’s Hypersonic Motor (HSM) uses ultrasonic waves to drive the autofocus mechanism. It is extremely quiet, fast and accurate, so is well suited to a wide range of photo and video applications.
The lens has an image circle large enough to be used on a full-frame camera. It can also be used on cameras with a smaller ‘crop’ sensor, provided the mount is compatible.
The lens has a filter thread around the front element onto which filters and filter holders can be attached.
The mount is the part of the lens that attaches to the camera body. A coated brass mount is used for strength, and is surrounded by a rubber seal to keep out dust and moisture.
This switch toggles between autofocus and manual focus.
The diaphragm is constructed of nine rounded blades for a circular aperture opening and round out-of-focus highlights.