Sigma 45mm f/2.8 DG DN Contemporary Lens for Leica L

The Sigma 45mm f/2.8 DG DN Contemporary Lens for Leica L is a compact, normal-length prime lens designed for full-frame Leica L-mount mirrorless cameras, embodying the Contemporary line’s “pursuing optimum balance” philosophy by combining an easy-to-carry size with high optical performance. It’s well suited as a perfect first lens for full-frame mirrorless photographers, sitting between a 35mm wide-angle and a 50mm standard lens to offer a highly natural, “normal” perspective that closely mimics how the human eye sees the world.

Optically, the lens is built from 8 elements in 7 groups, with the optical design specifically controlling spherical aberrations to produce large, soft, rounded bokeh in both the foreground and background while enhancing a three-dimensional impression of the subject. Vignetting is accounted for in the design to achieve beautiful, round bokeh while suppressing swirly bokeh effects. A rounded 7-blade diaphragm, combined with a maximum aperture of f/2.8 (down to f/22), delivers smooth, classical-looking background rendering wide open, while still producing modern, sharp results when stopped down.

Autofocus is handled by a stepping motor, delivering fast, precise, and near-silent focusing well suited to both photographers and videographers, including smooth performance during Face/Eye Detection AF and video shooting, with full-time manual focus control also available. A manual aperture ring offers a satisfying, tactile click for comfortable operation across various shooting styles, and the lens has a close minimum focusing distance of 9.45 in. (24cm), yielding a maximum magnification ratio of 1:4 (0.25x), making it suitable for snapshots, tabletop photography, and other close-up work.

Build quality includes an all-metal construction with a dust- and splash-resistant mount structure, giving the lens a durable, premium feel consistent with Sigma’s Contemporary line standards. The lens is compatible with Sigma’s optional USB Dock (UD-11) for firmware updates and fine-tuning (L-mount only). It measures approximately 2.52 in. (64.0mm) in diameter by 1.82 in. (46.2mm) in length and weighs just 7.58 oz. (215g), and accepts a 55mm filter thread.

As a full-frame L-mount lens, the Sigma 45mm f/2.8 DG DN Contemporary delivers its full 51.3-degree angle of view on full-frame L-mount bodies from Leica, Panasonic, and Sigma, while remaining compatible with APS-C L-mount cameras at a 68mm-equivalent effective focal length.

Key Features
– 45mm f/2.8 normal-length prime lens (Contemporary series) for full-frame Leica L-mount
– 8 elements in 7 groups optical construction
– Spherical aberration control for large, soft, rounded bokeh
– Stepping motor autofocus with full-time manual focus override
– Manual aperture ring with tactile click
– Rounded 7-blade diaphragm
– All-metal, dust- and splash-resistant construction
– Minimum focusing distance of 9.45 in. (24cm); 1:4 (0.25x) maximum magnification
– 55mm filter thread
– Compatible with optional Sigma USB Dock (UD-11, L-mount only)
– No image stabilization
– Compact, lightweight design (approximately 215g)
– Compatible with full-frame and APS-C L-mount cameras (Leica, Panasonic, Sigma)