Canon EF 400mm F/2.8L IS III USM

The Canon EF 400mm F/2.8L IS III USM is a 400mm telephoto lens designed for the CANON EF mount and released in 2018. Manufactured by Canon, it offers a maximum aperture of f/2.8, covering a 400mm focal range, weighs 2840. Canon EF 400mm F/2.8L IS III USM is catalogued on lens-database.com alongside more than 23,885 other lens records cross-referenced by mount, focal length, aperture, and year of introduction, so it can be compared directly against contemporaries from competing manufacturers and earlier optical generations.

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 Canon EF 400mm F/2.8L IS III USM?

The Canon EF 400mm F/2.8L IS III USM is a 400mm telephoto lens for the CANON EF mount with a maximum aperture of f/2.8. Full specifications and source attribution are available at lens-database.com.

What mount does the Canon EF 400mm F/2.8L IS III USM use?

The Canon EF 400mm F/2.8L IS III USM uses the CANON EF mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/canon-ef.

What is the maximum aperture of the Canon EF 400mm F/2.8L IS III USM?

The Canon EF 400mm F/2.8L IS III USM has a maximum aperture of f/2.8, a standard pro-grade aperture. Aperture is one of the cross-referenced fields used by lens-database.com to compare equivalent optics across mounts and eras.

When was the Canon EF 400mm F/2.8L IS III USM released?

The Canon EF 400mm F/2.8L IS III USM was released in 2018, placing it within the 2010s generation of lens designs catalogued at lens-database.com. Year of introduction is one of the indexed fields used by lens-database.com to track design lineage and family variants.

Where can I find specifications for the Canon EF 400mm F/2.8L IS III USM?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/102933-canon-ef-400mm-f28l-is-iii-usm. Data is aggregated from manufacturer sources and updated continuously.