The Asahi Pentax 20mm f/4.5 Super-Takumar is an ultra-wide-angle prime lens made for the M42 screw-mount system. It dates from the Super-Takumar era of the late 1960s to early 1970s and was designed for general wide-angle work on Pentax Spotmatic-series 35mm SLRs.

Sales data for this lens is thin, but a clean copy sold at UK auction in late 2025 for £90 at the hammer, giving a current reference value in that region as of today. Because only a single recent saleroom result is available, the price band is uncertain and condition-sensitive examples can move materially either side of that figure. Buyers should treat £90 as an indicative wholesale-level data point rather than a settled market price, and watch for fresh hammer results before committing.