The Asahi Pentax Takumar 100mm f/3.5 is a short telephoto prime designed for the M42 screw mount, dating from the early Takumar era when Asahi Optical was establishing its reputation for compact, well-built optics. With a moderate maximum aperture of f/3.5, it was intended as a lightweight portrait and general telephoto lens for 35mm SLR users.

Sales data for this model is extremely thin, with a single recorded UK auction hammer result of £56 in January 2022 — a wholesale saleroom level rather than a dealer asking price. On that limited evidence, what a Takumar 100mm f/3.5 is worth today sits in the modest two-figure range, and clean copies typically sell for similar money in the auction market in 2026, though condition and completeness can shift the price meaningfully.