The Asahi Pentax 105mm f/2.8 Auto-Takumar is a medium telephoto prime lens from the late 1950s M42 screw-mount era, designed as a short portrait and general-purpose telephoto for early Asahi Pentax SLRs. It features the semi-automatic 'Auto' diaphragm system that preceded the fully automatic Super-Takumar line.

At recent UK auction the 105mm f/2.8 Auto-Takumar is a low-value collector piece, with hammer prices ranging from £25 to £100 across the sales on record and a median around £45. As of 2026 the lens sells for modest money at saleroom level, and clean, haze-free examples sit toward the upper end of that band while tired copies change hands for pocket change.