Leica's R-mount telephoto — APO-Telyt 180mm f/3.4 with apochromatic correction.
The Leica APO-Telyt-R 180mm f/3.4 (3 Cam) is a telephoto prime for the Leica R SLR system with APO (apochromatic) correction. APO-Telyt designates an apochromatic telephoto lens class. 3-Cam enables metering on Leica M bodies via M-Adapter-R. Leica R mount.
f/3.4 maximum aperture. 180mm focal length (full-frame). APO apochromatic correction. 3-Cam coupling. Manual focus. At approximately 900g. 67mm filter thread. Leica R mount.
APO correction at 180mm provides high resolution and micro-contrast at telephoto distances. f/3.4 is slightly faster than f/4 but slower than f/2.8. 3-Cam enables M-body metering; for adapted mirrorless use cam type is irrelevant. An optically premium telephoto for adapted mirrorless or R-body use.
On the used market the Leica APO-Telyt-R 180mm f/3.4 (3 Cam) is a premium APO telephoto prime. Condition checks: 67mm front element, three cam contacts for wear, aperture blade condition, focus ring smoothness. Leica R mount — requires adapter for current cameras.