Part of the I series range of lenses from Sigma’s Contemporary line-up, this full-frame standard prime for mirrorless cameras delivers outstanding optical performance in a compact body. The lens has an all-metal build, including an all-metal hood, metal aperture ring, metal focus ring and even a magnetic metal lens cap. Despite this it weighs in at only 350g and is only 7cm in length, making it a remarkably portable option for photographers needing to travel light.
Thanks to Sigma’s cutting-edge stepping motor technology, the lens focuses very quickly and quietly, and its bright F2 aperture ensures fast shutter speeds in low light as well as a shallow depth-of-field if required. The versatile 50mm focal length makes the lens ideal for street, landscape, portrait, wedding, event and travel photography.
As with the other optics in the I series range of premium compact primes, the 50mm F2 has an all-metal build comprising precision-cut aluminium parts. Its robust construction and ultra-portable design make it perfect for a wide range of photographic applications. The lens has a rubber seal around the mount to stop dust and moisture from getting in.
A manual aperture ring allows photographers to change aperture on the lens or, using the Auto setting, on the camera if preferred. The movement of the ring is exceptionally smooth and the clicks well define, ensuring precise operation.
The tactile knurled metal finish used for the lens hood, focus ring and aperture ring make handling the lens and changing settings extremely intuitive. Included with the lens is a magnetic metal lens cap in addition to the regular plastic cap, which further improves ease of use.
Metal mount with seal
Protects against dust and moisture.
Including metal aperture and focus rings.
Despite being small and light, the 50mm F2 does not compromise on optical quality. Its advanced optical design includes 11 elements in 9 groups, of which 3 are aspherical elements and 1 is an SLD element. These help keep the lens compact while greatly reducing the appearance of chromatic aberration around areas of high contrast.
A Super Multi-Layer coating on the surface of the elements helps keep flare and ghosting to a minimum.
Owing to its bright F2 aperture the lens has a shallow depth-of-field, which helps separate the subject from the background. The out of focus areas are smooth and attractive and don’t distract from the subject.
The bright aperture also allows for faster shutter speeds in low light.
The 50mm focal length is excellent for waist-up portraits, as it gives the most flattering perspective on the face for this composition. The optics are extremely sharp even at F2, ensuring exceptional subject detail.
The 50mm F2 DG DN | C weighs in at just 350g, which is just over half the weight of the 50mm F1.4 DG DN | A. This makes it well-suited to photographers who need lightweight and compact kit. Both lenses have an aperture ring and premium build quality, although the Art lens does have a faster aperture and more advanced features.
Available as a separate accessory Sigma’s innovative magnetic lens cap holder can be clipped to clothing or a bag to securely hold any I series magnetic lens cap. This helps keep the cap safe while the camera is in use.
The lens is part of the I series range of primes, which sit in the Contemporary line-up. They are designed to offer mirrorless photographers outstanding optical quality and premium usability in a compact package.
With similar optical character and the same sleek external design, the lenses are ideally used as a set, ensuring consistent bokeh, colour rendition, optical precision and usability.
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.
11 elements in 9 groups
Angle of view
Number of diaphragm blades
9 (rounded diaphragm)
Minimum focusing distance
Maximum magnification ratio
Dimensions (diameter x length)
ø70.0mm × 68.0mm
Corresponding AF mounts
L-Mount | Sony E
Sony E barcode
Specifications are for L-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.
The magnetic lens cap comes boxes with all I series lenses (except the 45mm F2.8), in addition to the standard plastic cap. It attaches to the lens magnetically.
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.
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.