Tomioka Tomioka 55mm f1.4 Heritage

Overview

The Tomioka 55mm f/1.4 is one of the great 'ghost' lenses of Japanese optical history, sold under a variety of brand names rather than under Tomioka's own label. Tomioka Optical Works was founded in 1924 by Masahige Tomioka, reportedly a former employee of Nippon Kogaku (now Nikon), and the company built a reputation through the 1960s as an OEM supplier of high-quality optics to numerous camera makers. The 55mm f/1.4 design appeared in the early-to-mid 1960s and surfaced under labels such as AUTO RIKENON (released around 1964 for the Ricohflex TLS), Chinon, Revuenon, and later Yashinon after Yashica acquired Tomioka in 1968. Because the branding varied and the nameplates rarely say 'Tomioka,' identifying a genuine Tomioka-made copy relies on community detective work — reviewers note that not all examples carry factory wording, so provenance is often inferred rather than confirmed. The lens has a cult following precisely because of this shadowy pedigree: enthusiasts chase it as a Tomioka design at a fraction of the cost of the more famous Yashinon/Tomioka 55mm f/1.4, and it is prized for its smooth bokeh and solid build. No specific established nickname is evidenced in the reviews, though Tomioka's 55mm designs are broadly celebrated in the vintage community.

Verdict: The Tomioka 55mm f/1.4 is a lens for the vintage enthusiast who values pedigree and character over clinical performance. It rewards those who stop down for sharpness and enjoy coaxing muted, filmic colours to life in post-processing, offering creamy bokeh and a distinctive understated look. Buyers chasing dramatic swirl or huge, punchy bokeh from its large barrel may be disappointed — its charm is subtle. As an affordable route into Tomioka glass, it is a satisfying collectible and a capable portrait/close-up lens for the patient shooter.

Optical Character

Bokeh

Smooth and creamy, almost dreamy wide open, though blur size is surprisingly modest given the lens's bulk.

Color

Muted and not very vivid, producing grey-ish RAW files that lift well in post.

Sharpness wide open

Sharp when stopped down to around f4 and on close subjects, but soft wide open at f/1.4 beyond very near focus.

Contrast

Relatively low global contrast wide open, limited by the single-coated design.

Vignetting

Pronounced wide open, making images look as though a vignette has already been applied.

Community Insights

What people love

Smooth, creamy, almost dreamy bokeh wide open that flatters portraits and close-ups
Sharpness once stopped down to around f4, becoming quite crisp for scenics and detail
Excellent handling — easy to focus and easy to use in the field
The allure of owning a genuine Tomioka-made optic at a lower price than the famous Yashinon-badged versions
Solid, substantial build quality that feels premium in hand

What people dislike

Soft and low-contrast wide open beyond very close subjects
Muted, not-very-vivid colours that require post-processing to come alive
Heavy vignetting wide open that makes images look pre-vignetted
Large and heavy body that doesn't deliver the massive bokeh its size might imply
CA and colour fringing on high-contrast edges at the first two stops

Pro Tips

Stop down to f4 or beyond for the sharpest results; treat f1.4 as a look for bokeh and close subjects rather than critical sharpness
Shoot RAW and plan to lift shadows and boost saturation/contrast in Lightroom — the files are intentionally flat and respond well
Embrace the wide-open vignette as part of the character, or correct it in post if you want an even frame
Use a thin M42-PK adapter for Pentax DSLRs or an M42-NEX adapter for Sony mirrorless bodies
Set the Auto/Manual switch to use it in aperture-priority mode on Pentax DSLRs

Sources (1)

Web-grounded synthesissecondary

The Tomioka 55mm f/1.4 is one of the great 'ghost' lenses of Japanese optical history, sold under a variety of brand names rather than under Tomioka's own label. Tomioka Optical Works was founded in 1924 by Masahige Tomioka, reportedly a former employee of Nippon Kogaku (now Nikon), and the company built a reputation through the 1960s as an OEM supplier of high-quality optics to numerous camera makers. The 55mm f/1.4 design appeared in the early-to-mid 1960s and surfaced under labels such as AUTO RIKENON (released around 1964 for the Ricohflex TLS), Chinon, Revuenon, and later Yashinon after Yashica acquired Tomioka in 1968. Because the branding varied and the nameplates rarely say 'Tomioka,' identifying a genuine Tomioka-made copy relies on community detective work — reviewers note that not all examples carry factory wording, so provenance is often inferred rather than confirmed. The lens has a cult following precisely because of this shadowy pedigree: enthusiasts chase it as a Tomioka design at a fraction of the cost of the more famous Yashinon/Tomioka 55mm f/1.4, and it is prized for its smooth bokeh and solid build. No specific established nickname is evidenced in the reviews, though Tomioka's 55mm designs are broadly celebrated in the vintage community.

https://overland25.com/en/en_vintagelens/auto-rikenon-55mm-f14-tomiokahttps://www.pentaxforums.com/userreviews/chinon-tomioka-made-55mm-f14-auto-m42.htmlhttps://nadinthomson.co.uk/tomioka-chinon-55mm-sample-images/