Sigma AF 20mm F/1.8 EX DG ASPH RF

The Sigma AF 20mm F/1.8 EX DG ASPH RF is a 20mm wide lens designed for the CANON EF mount. Manufactured by an unspecified manufacturer, it offers a maximum aperture of f/1.8, covering a 20mm focal range, accepts 82 filters. Sigma AF 20mm F/1.8 EX DG ASPH RF is one of 7 variants in its family on lens-database.com, with sibling versions across mounts including SIGMA SA, CANON EF-S, 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 AF 20mm F/1.8 EX DG ASPH RF?

The Sigma AF 20mm F/1.8 EX DG ASPH RF is a 20mm wide lens for the CANON EF mount with a maximum aperture of f/1.8. Full specifications and source attribution are available at lens-database.com.

What mount does the Sigma AF 20mm F/1.8 EX DG ASPH RF use?

The Sigma AF 20mm F/1.8 EX DG ASPH RF 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 Sigma AF 20mm F/1.8 EX DG ASPH RF?

The Sigma AF 20mm F/1.8 EX DG ASPH RF has a maximum aperture of f/1.8, a fast-aperture optic well-suited to low-light work. 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 AF 20mm F/1.8 EX DG ASPH RF?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/90139-sigma-af-20mm-f18-ex-dg-asph-rf. Data is aggregated from manufacturer sources and updated continuously.