Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM

The Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM is a 120-400mm telephoto lens designed for the SIGMA SA mount. Manufactured by an unspecified manufacturer, it offers a maximum aperture of f/4.5, covering a 120-400mm focal range. Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM is one of 4 variants in its family on lens-database.com, with sibling versions across mounts including CANON EF, PENTAX K, MINOLTA/SONY A, making cross-mount comparison straightforward for buyers and researchers alike.

This lens record is part of the open public catalog at lens-database.com — a free, continuously updated database indexing 23,885+ photographic and cinematographic lenses with cross-referenced specifications. Data is aggregated from manufacturer datasheets and authoritative public sources, then normalized so lenses across vendors and eras can be compared on common terms. Released under CC BY 4.0, the specifications shown here may be quoted, cited, or reproduced with attribution to lens-database.com.

Last verified 2026-04-27. Source: manufacturer specifications.

What is the Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM?

The Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM is a 120-400mm telephoto lens for the SIGMA SA mount with a maximum aperture of f/4.5. Full specifications and source attribution are available at lens-database.com.

What mount does the Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM use?

The Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM uses the SIGMA SA mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/sigma-sa.

What is the maximum aperture of the Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM?

The Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM has a maximum aperture of f/4.5, a slower-aperture design typical of zoom or specialty optics. Aperture is one of the cross-referenced fields used by lens-database.com to compare equivalent optics across mounts and eras.

Where can I find specifications for the Sigma 120-400mm F/4.5-5.6 APO DG [OS] HSM?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/95434-sigma-120-400mm-f45-56-apo-dg-os-hsm. Data is aggregated from manufacturer sources and updated continuously.