Tokina RMC Heritage

Overview

The Tokina RMC (Rainbow Multi-Coating) line represents Tokina's push into affordable, competent third-party optics during the SLR era of the late 1970s and 1980s, when photographers sought decent glass without paying OEM prices. The RMC 28mm f/2.8 in particular was a compact, budget wide-angle designed for 35mm and full-frame SLRs, available in Pentax K-mount (both PK and PKA) as well as other mounts of the era. It was also rebadged and sold as a Hoya 28mm f/2.8, and was eventually succeeded by the remodelled Tokina SL28 28mm f/2.8, distinguishable by its 49mm filter thread. The 'RMC' designation refers to Tokina's Rainbow Multi-Coating, a marketing name for their multicoated glass; some early Tokina lenses of the broader SL/RMC family were reportedly single-coated with only later ones receiving multicoating. In the ultra-wide category, the related Tokina 17mm 3.5 SL RMC was one of the few affordable ultra-wide primes of its day, valued by photographers looking for wide coverage on a budget. These lenses have earned a modest cult following largely for their affordability (the 28mm averages under $30 used), portability, and pleasant vintage rendering rather than clinical perfection. No specific established nickname is evidenced in the reviews.

Verdict: The Tokina RMC 28mm f/2.8 is a compact, lightweight, and inexpensive manual-focus wide-angle that rewards budget-minded shooters and vintage-lens enthusiasts. It won't match OEM Pentax glass for edge sharpness or refinement, but with good center sharpness from f/4-f/8, pleasant bokeh, and a slightly vintage character, it's a strong value for street, landscape, and close-up photography — ideal for those adapting to Pentax DSLRs or mirrorless systems who want a characterful wide-angle without spending much.

Optical Character

Bokeh

Pleasant bokeh from a 6-blade diaphragm with no swirl or bubble characteristics.

Sharpness wide open

Good center sharpness from f/4 to f/8, while edges can be soft wide open.

Flare resistance

unknown; RMC multicoating is intended to improve flare resistance but reviews do not detail behavior.

Contrast

Moderate contrast per the reviews.

Community Insights

What people love

Excellent value — averaging around $29 used with 88% of reviewers recommending it
Highly portable and compact: the 28mm weighs just 160g and measures 36mm in length
Solid build quality with a smooth focus ring and all-metal construction in early versions
Good center sharpness from f/4 to f/8
Pleasant bokeh and a slightly vintage rendering character
Native K-mount means it mounts directly on Pentax DSLRs and adapts easily to mirrorless (Sony E, Canon RF, Micro Four Thirds) with no electronics or modifications

What people dislike

Edge performance can be soft wide open (RMC 28mm f/2.8)
Not as refined as OEM Pentax 28mm lenses
Manual focus only, which the focusing score of 7.0 reflects
Older/haze-prone copies exist — one reviewer's 17mm SL RMC copy turned out very hazy and unusable

Pro Tips

Stop down to f/4-f/8 for the best sharpness, especially toward the edges
Take advantage of the 0.3m minimum focus distance for close-up work
Inspect for haze before buying, as some copies in this family suffer from it

Sources (1)

Web-grounded synthesissecondary

The Tokina RMC (Rainbow Multi-Coating) line represents Tokina's push into affordable, competent third-party optics during the SLR era of the late 1970s and 1980s, when photographers sought decent glass without paying OEM prices. The RMC 28mm f/2.8 in particular was a compact, budget wide-angle designed for 35mm and full-frame SLRs, available in Pentax K-mount (both PK and PKA) as well as other mounts of the era. It was also rebadged and sold as a Hoya 28mm f/2.8, and was eventually succeeded by the remodelled Tokina SL28 28mm f/2.8, distinguishable by its 49mm filter thread. The 'RMC' designation refers to Tokina's Rainbow Multi-Coating, a marketing name for their multicoated glass; some early Tokina lenses of the broader SL/RMC family were reportedly single-coated with only later ones receiving multicoating. In the ultra-wide category, the related Tokina 17mm 3.5 SL RMC was one of the few affordable ultra-wide primes of its day, valued by photographers looking for wide coverage on a budget. These lenses have earned a modest cult following largely for their affordability (the 28mm averages under $30 used), portability, and pleasant vintage rendering rather than clinical perfection. No specific established nickname is evidenced in the reviews.

https://www.pentaxforums.com/userreviews/tokina-mf-28mm-f2-8.htmlhttps://phillipreeve.net/blog/review-tokina-17mm-3-5-sl-rmc/