When using the lens on a tripod, a tripod socket (sold separately) can be attached, helping to reduce strain on the camera body and offering better balance on the tripod. The tripod socket comes with a strap which also helps lessen strain on the camera and lens mounts when carrying or transporting the lens.

When paired with one of two new SIGMA teleconverters – TC-1411 (1.4x) and TC-2011 (2x) (sold separately, L-Mount only) – the SIGMA 100-400mm F5-6.3 DG DN OS | C offers photographers a focal length of up to 800mm. AF is effective even with the teleconverter is attached.

By connecting the lens to SIGMA USB DOCK (sold separately, L-Mount only), which was newly developed for use with mirrorless cameras, users can adjust the amount of focus movement when operating the focus ring using SIGMA Optimization Pro software. This gives more accurate manual focus control.

The construction of the lens is designed to be both light and robust, with careful consideration given to utilising the right materials in the right place. Magnesium alloy, for example, which is very strong, is used around the tripod socket attachment, whereas for some other parts of the barrel, durable but light polycarbonate is used.

The lens features the dust- and splash-proof seal on the mount to stop contamination in difficult shooting environments such as on beaches and during rainfall. There’s also a water- and oil-repellent coating on the frontmost surface of the lens, which helps keep the from element clear of debris.

• Compatible with high-speed autofocus
• Compatible with lens-based optical correction

^{* Only on camera models that support this functionality. Scope of correction varies depending on camera model.}

• Designed to minimize flare and ghosting
• Every single lens produced undergoes SIGMA’s proprietary MTF measuring system “A1”
• 9-blade rounded diaphragm
• High-precision, durable, brass bayonet mount
• Lens hood included
• ‘Made in Japan’ craftsmanship

Our new lineup fully expresses our approach to lenses and photography itself. All of our lenses belong to one of three lines—Contemporary, Art, or Sports—all of which share our development philosophy and advanced manufacturing system. High performance, high quality, and high end in every respect, these lenses give people who love photography lasting value and consistent, exciting results. The secret is our passion for craftsmanship that we put into every production process and every product.

We used to measure lens performance with MTF measuring system using conventional sensors. However, we’ve now developed our own proprietary MTF (modulation transfer function) measuring system (A1) using 46-megapixel Foveon direct image sensors. Even previously undetectable high-frequency details are now within the scope of our quality control inspections. All Sigma lenses are checked using this ‘A1’ system before they are shipped.

* A1: Aizu1

All Sigma’s manufacturing – right down to moulds and parts – with a few exceptions, are carried out under a single integrated production system, entirely in Japan. We are now one of the very few manufacturers whose products are solely “made in Japan”. We like to think our products are somehow imbued with the essence of our homeland, blessed as it is with clean air and water, and focused, hard-working people. We pride ourselves on the authentic quality of Sigma products, born of a marriage between highly attuned expertise and intelligent, advanced technology. Our sophisticated products have satisfied professionals and lovers of photography all over the world because our manufacturing is based on genuine craftsmanship, underpinned by the passion and pride of our experts.

As an experienced lens manufacturer that has been creating a diverse range of interchangeable lenses, we have started the innovative chargeable service “Mount Conversion Service”. With this service, the mount of your current SIGMA lenses can be changed to another mount of your choice. It gives a new life to your favourite lenses when you wish to use it on a different camera body.

* This “Mount Conversion Service” is different from a normal repair. In order to apply for the service, please contact your nearest authorized subsidiary/distributor of SIGMA.