The Asahi Pentax 135mm f/2.5 SMC Takumar is a medium telephoto prime lens in the M42 screw mount, produced during the Super-Multi-Coated Takumar era of the early 1970s. It was designed as a fast short-tele for portraits, stage work, and general reach on 35mm SLRs, and its SMC coating reflects Asahi's multi-coating technology that became a Takumar hallmark.

At recent UK auction, hammer prices for the 135mm f/2.5 SMC Takumar have ranged from £40 to £106, with a median around £50 based on the sales on record. As of 2026, clean copies with smooth focus and clear glass tend to sell for the upper end of that band in the saleroom, while well-used examples are worth closer to £40–£50. Because the sample is small, a single exceptional copy can shift what this lens is worth on any given sale day.