The Contax 140mm f/2.8 Sonnar is a medium-telephoto Sonnar-formula lens made for the Contax system. Sitting just beyond the classic 135mm portrait length, it was intended for portraiture, candid work and short-range telephoto shooting where the Sonnar design's smooth rendering is valued.

Hammer prices at UK auction are thin on the ground for this lens, with a single recorded sale at £230 in 2023 setting the only firm reference point as of today. As wholesale saleroom results (excluding buyer's and seller's commission), that figure suggests a clean copy is worth broadly in that region, though with so few data points the lens's true value and what it sells for at retail can vary noticeably with condition and completeness.