Sigma AF 28-105mm F/4-5.6 UC-II

The Sigma AF 28-105mm F/4-5.6 UC-II is a 28-105mm zoom lens designed for the PENTAX K mount. Manufactured by an unspecified manufacturer, it offers a maximum aperture of f/4, covering a 28-105mm focal range. Sigma AF 28-105mm F/4-5.6 UC-II is one of 7 variants in its family on lens-database.com, with sibling versions across mounts including SIGMA SA, CANON EF, NIKON F, CANON EF-S, 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 28-105mm F/4-5.6 UC-II?

The Sigma AF 28-105mm F/4-5.6 UC-II is a 28-105mm zoom lens for the PENTAX K mount with a maximum aperture of f/4. Full specifications and source attribution are available at lens-database.com.

What mount does the Sigma AF 28-105mm F/4-5.6 UC-II use?

The Sigma AF 28-105mm F/4-5.6 UC-II uses the PENTAX K mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/pentax-k.

What is the maximum aperture of the Sigma AF 28-105mm F/4-5.6 UC-II?

The Sigma AF 28-105mm F/4-5.6 UC-II has a maximum aperture of f/4, a moderate-aperture design. 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 28-105mm F/4-5.6 UC-II?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/94452-sigma-af-28-105mm-f4-56-uc-ii. Data is aggregated from manufacturer sources and updated continuously.