The Leitz 35mm f/4 PA Curtagon-R is a perspective-adjustment (shift) wide-angle lens in Leica R bayonet mount, built for the Leicaflex and R-series SLR bodies. The 'PA' designation denotes its lateral shift mechanism, intended for architectural and product work where converging verticals need to be corrected in-camera. It is a specialist optic rather than a general-purpose 35mm.

At UK auction in recent years, hammer results for this lens have ranged from roughly £180 to £300, with a median around £188 — wholesale saleroom levels rather than dealer retail. The small sample and long span between results (2001 to 2015) means today's value for a clean, fully-functioning example is best anchored to the upper end of that range; cosmetically tired copies or ones with stiff shift mechanisms sell for noticeably less. As of 2026 the lens remains a niche collector's item, so what a PA Curtagon-R is worth depends heavily on the state of its shift tracks and glass.