Designed for APS-C DSLRs, the 50-100mm F1.8 is a high-performance mid-telephoto optic that combines prime level image quality and a fast aperture with the convenience of a zoom. Its complex optical design of 21 elements includes 3 SLD and 4 FLD elements, which help ensure extremely minimal chromatic aberration an any aperture or focal length.
With a full-frame equivalent focal length of 75-150mm, the lens is perfect for a wide range of photo and video applications, including portraits, events, weddings and wildlife. The lens’s fast constant F1.8 aperture ensures fast shutter speeds in low light conditions, as well as a shallow depth-of-field for high impact results. The lens is also available in SIGMA’s line-up of high speed zoom cine lenses.
The superb build quality of the 50-100mm F1.8 DC HSM is exactly as you’d expect from an Art-line lens, both in its intuitive ergonomics and in the quality of craftsmanship.
The lens’ outer barrel is made of a polycarbonate called Thermally Stable Composite (TSC), which is not only strong and light, but has a similar thermal expansion rate to aluminium. This ensures that the interior aluminium parts and the exterior TSC parts behave in the same way as temperatures change.
The focus ring is rubberised for easier operation, and focusing is internal, meaning the lens never changes length.
To help ensure a balanced set-up when used on a tripod, a tripod collar is built in, which can be rotated for To reduce flare and ghosting in bright sunlight, and to help protect the bulbous 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 50-100mm F1.8 DC HSM | Art for DSLRs boasts outstanding optical quality, with excellent rendering of detail right into the corners even wide open at F1.8.
The lens has an advanced optical design made up of 21 elements in 15 groups, including 3 SLD elements and 4 FLD elements. This ensures razor-sharp results with very minimal chromatic aberration, flare, distortion and vignetting.
An advanced Super Multi-Layer Coating helps to reduce flare and ghosting when working in bright direct sunlight.
With its F1.8 constant aperture and mid-telephoto focal length, the 50-100mm is perfect for portrait photography. The bokeh is smooth and attractive and does not distract from the in-focus subject.
These two F1.8 crop-sensor Art primes are perfect companion lenses, with the 18-35mm covering wide-angle to wide-standard, and the 50-100mm cover standard to mid-telephoto. Together they cover the most commonly shot focal lengths with only a small gap between 35mm and 50mm.
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.
21 elements in 15 groups
Angle of view
Number of diaphragm blades
9 (rounded diaphragm)
Minimum focusing distance
Maximum magnification ratio
Dimensions (diameter x length)
ø93.5mm × 170.7mm
Corresponding AF mounts
Canon EF | Nikon F | Sigma SA
Canon EF barcode
Nikon F barcode
Sigma SA barcode
Specifications are for SIGMA SA mount
A special coating applied to the front element to help repel water and oil.
Mounting a camera with a heavy lens on a tripod puts huge strain on the camera’s tripod thread. To get around this some telephoto lenses have a tripod socket so that the camera and lens attach to the tripod at or close to their centre of gravity. This ensures a more balanced set-up.
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 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.
The lens has an image circle large enough to be used on a camera with an APS-C / S35 (or smaller) sensor. It can also be used on cameras with a full-frame sensor, but only in the camera’s crop mode.
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.