Cosina Auto Cosinon 45mm F/2.8 MC

The Cosina Auto Cosinon 45mm F/2.8 MC is a 45mm prime lens designed for the PENTAX K mount and released in 1979. Manufactured by Cosina, it offers a maximum aperture of f/2.8, covering a 45mm focal range, accepts 49 filters. Cosina Auto Cosinon 45mm F/2.8 MC 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 Cosina Auto Cosinon 45mm F/2.8 MC?

The Cosina Auto Cosinon 45mm F/2.8 MC is a 45mm prime lens for the PENTAX K mount with a maximum aperture of f/2.8. Full specifications and source attribution are available at lens-database.com.

What mount does the Cosina Auto Cosinon 45mm F/2.8 MC use?

The Cosina Auto Cosinon 45mm F/2.8 MC 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 Cosina Auto Cosinon 45mm F/2.8 MC?

The Cosina Auto Cosinon 45mm F/2.8 MC 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 Cosina Auto Cosinon 45mm F/2.8 MC released?

The Cosina Auto Cosinon 45mm F/2.8 MC was released in 1979, placing it within the 1970s 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 Cosina Auto Cosinon 45mm F/2.8 MC?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/103059-cosina-auto-cosinon-45mm-f28-mc. Data is aggregated from manufacturer sources and updated continuously.