The SMC Takumar 15mm f/3.5 is an ultra-wide-angle prime lens for Asahi Pentax's M42 screw-mount system, dating from the 1970s. It was designed to deliver an extreme angle of view for landscape, architectural and reportage work on 35mm SLR bodies, and remains a sought-after specialist optic among M42 collectors and adapter users today.

Sales data for this lens is thin: a single recorded UK auction result from March 2022 saw a clean example sell for £600 at hammer (a wholesale saleroom result, exclusive of buyer's and seller's commission). With only one data point, it is difficult to define a reliable price band in 2026, but that figure suggests the 15mm Takumar is worth materially more than common Takumar primes, reflecting its rarity and the enduring demand for ultra-wide M42 glass.