The Asahi Pentax Super-Multi-Coated Takumar 135mm f/2.5 is a fast medium-telephoto prime in the M42 screw mount, produced during the early 1970s as part of Pentax's S-M-C Takumar line. It was designed for portraiture and middle-distance work on Pentax Spotmatic-era SLRs, and today it is widely adapted to mirrorless bodies, which keeps demand and resale value steady.

Auction data for this lens is thin: a single UK saleroom hammer of £100 in March 2022 is the only verified data point, so any sense of what the lens is worth today rests on a very small sample. Clean, fungus-free copies with smooth focus tend to sell for roughly that level at recent UK auction, with rougher examples going for less and exceptional glass occasionally pushing higher. Because these are auction-hammer results rather than dealer asking prices, retail value on the same lens is typically meaningfully higher.