The Dallmeyer 0.8 inch f/1.9 Rareac is a small-format fast prime lens from the British maker J.H. Dallmeyer, with a roughly 20mm focal length and an f/1.9 maximum aperture intended for sub-miniature cine or specialist optical use. It belongs to Dallmeyer's mid-twentieth-century output and is an uncommon item on the secondary market today.

With only one tracked UK auction hammer result, a single example sold for £150 in January 2023 at saleroom level, which sets the only firm reference point for what this lens is currently worth. Because hammer prices are wholesale levels achieved before buyer's premium, retail asking prices from dealers in 2026 typically sit higher than this figure, and the thin sample size means the value of any individual copy can swing significantly with condition and completeness. Until more comparable sales appear, treat the £150 print as an indicative price rather than a reliable median.