The Voigtlander 21mm f/1.8 Ultron is a fast-aperture wide-angle prime lens for Leica M-mount cameras. Key features include:
Great for low-light and shallow depth-of-field photography
Manual focus ring and half-stop aperture clicks
Rangefinder coupling
Durable, high-quality metal build
Rangefinder Coupling. The Voigtlander 21mm f/1.8 Ultron offers rangefinder-coupled focusing from 0.7m to infinity, with an additional close-focusing option down to 0.5m using the hyperfocal distance method.
Fast Aperture. The fast f/1.8 aperture allows you to capture images with a shallow depth of field, providing smooth background blur for true subject isolation. It’s great for low-light photography.
High-Quality Build. This lens features a sturdy, high-quality metal build with a smooth, long-throw focus ring and half-stop aperture clicks for minute adjustments. It features a built-in petal hood to help minimize lens flare, and its eleven-group/thirteen-element optical design features one aspherical element to keep aberrations at bay.
Built-In Finder Lines. Many people shoot with the 21mm estimating from the widest set of built-in finder lines, but others prefer an externally mounted viewfinder.