Ricoh Rikenon 300mm F/4.5 APO

The Ricoh Rikenon 300mm F/4.5 APO is a 300mm telephoto lens designed for the PENTAX K mount and released in 1982. Manufactured by Ricoh, it offers a maximum aperture of f/4.5, covering a 300mm focal range. Ricoh Rikenon 300mm F/4.5 APO 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 Ricoh Rikenon 300mm F/4.5 APO?

The Ricoh Rikenon 300mm F/4.5 APO is a 300mm telephoto lens for the PENTAX K mount with a maximum aperture of f/4.5. Full specifications and source attribution are available at lens-database.com.

What mount does the Ricoh Rikenon 300mm F/4.5 APO use?

The Ricoh Rikenon 300mm F/4.5 APO 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 Ricoh Rikenon 300mm F/4.5 APO?

The Ricoh Rikenon 300mm F/4.5 APO 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.

When was the Ricoh Rikenon 300mm F/4.5 APO released?

The Ricoh Rikenon 300mm F/4.5 APO was released in 1982, placing it within the 1980s 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 Ricoh Rikenon 300mm F/4.5 APO?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/434392-ricoh-rikenon-300mm-f45-apo. Data is aggregated from manufacturer sources and updated continuously.