Overview

The Carl Zeiss Biogon T* 2,8/21 ZM is a superb ultra-wide lens for Leica M-mount, offering excellent sharpness and low distortion, rivaling the Leica Elmarit at a lower price. It has a metal build, 46mm filters, and focuses to 0.5m, but its modern silver finish may clash with classic Leica bodies. Weaknesses include the need for an external viewfinder and potential for corner distortion in portraits. It suits photographers seeking a high-quality, compact wide-angle for street, event, or landscape work, especially those who value filter compatibility and sunstar rendering.