The Asahi Pentax Super-Takumar 18mm f/11 Fisheye is an ultra-wide fisheye lens for the M42 screw mount, dating from the classic Takumar era. With its fixed f/11 aperture and compact construction, it was designed as a specialist optic for photographers needing a curvilinear ultra-wide perspective on Pentax SLR bodies.

Sales data for this lens is extremely thin: a single recorded UK saleroom result from March 2022 saw one sell for £94 at hammer (wholesale level, before commissions). With only one data point, that figure is the only concrete reference for what the lens is worth in today's auction market in 2026, and the true going price could vary widely depending on condition and completeness of accessories.