The Leitz 50mm f/2 APO-Summicron is an apochromatic standard prime offered in both L (screw-mount) and M-bayonet variants, aimed at photographers wanting a standard focal length with reduced chromatic aberration. It sits at the top of Leica's 50mm line and is often referred to simply as the APO-Summicron or APO-Cron by collectors. Designed for rangefinder use, it pairs the classic 50mm angle of view with the premium optical tier of Leica's standard lenses.

UK auction hammer results for this lens are unusually spread: the two recorded sales range from £3,750 (November 2025) to £28,000 (November 2018), with the higher figure almost certainly reflecting a scarce variant rather than a typical user copy. As of 2026, a clean standard M-bayonet example tends to sell for low four figures at saleroom level, while LTM or limited releases can command multiples of that price. With only two data points the median of roughly £15,875 is not representative — buyers should weight the recent £3,750 result when assessing what a standard copy is worth today.