The Leica APO-Summicron-M 35 f/2 ASPH lens exemplifies advanced engineering in compact lens design, pushing the boundaries of optical performance within the M-System. Renowned for its close-focusing ability, it boasts a minimum distance of 0.3m, the shortest in the M-lens series, which enables true close-up photography—a first for a 35mm lens in this system. It features an intricate arrangement of ten lens elements in five groups, including three aspherical surfaces and six elements crafted from glasses with anomalous partial dispersion, significantly reducing chromatic aberrations and ensuring apochromatic correction. The lens also introduces a tactile detent at 0.7m on the focusing ring, signaling the switch to close-focus mode, necessitating Live View or an EVF. Compact yet robust, this lens offers unparalleled image quality and a design that marries functionality with aesthetic appeal, making it the most compact full-frame 35mm lens with such exceptional optical prowess in the market. It supports a diagonal/horizontal/vertical view angle of 62.5°/53.6°/37.2° on full-frame cameras and comes with a precise focus scale, an 11-blade aperture mechanism, and a Leica M bayonet with 6-bit encoding, enhancing its usability and performance.