Tamron's fast 135mm for Konica — the BBAR multi-coated telephoto with good optics.
The Tamron 135mm f/2.8 Multi Coated BBAR is a fast telephoto prime from Tamron in Konica mount, featuring BBAR (Broad-Band Anti-Reflection) multi-coating for improved flare suppression. Tamron was among the early adopters of multi-coating in third-party lenses, and BBAR was their trade name for this technology.
The lens delivers 135mm at f/2.8 maximum aperture with BBAR multi-coating, Konica mount coupling, manual focus and aperture, and full-frame coverage. Tamron's optical and mechanical quality is generally above the average third-party standard of the period.
Tamron's BBAR coating was a genuine optical advancement for the era, meaningfully reducing the flare and ghosting that affected earlier single-coated telephoto lenses. The f/2.8 at 135mm is fast and useful for available-light photography. Tamron lenses in Konica mount are less common than M42 or Contax/Yashica versions.
Inspect BBAR coating condition for integrity. Test aperture blades at f/2.8 for oil-free operation. Check Konica mount coupling. Verify focus ring smoothness. The BBAR coating should show characteristic broad-band colour uniformity under angled light.