Sigma 105mm f/1.4 DG HSM Art Lens for Leica L

The Sigma 105mm f/1.4 DG HSM Art Lens for Leica L is a no-holds-barred short-telephoto, portrait-length prime lens distinguished by its bright maximum aperture and advanced optical layout. Designed for full-frame Leica L-mount mirrorless cameras, it’s the flagship of Sigma’s f/1.4 Art line, well suited to portrait and fine art photographers who want maximum peripheral brightness and professional-grade specifications.

Optically, the lens is built from 17 elements in 12 groups, including three FLD (fluorite-like low dispersion) elements, two SLD (Special Low Dispersion) elements, and one aspherical lens element, delivering minimal optical aberration alongside incredible resolution and stunning contrast. The lens’s large, 105mm-diameter front element contributes to improved peripheral illumination, helping reduce vignetting, while Sigma’s Super Multi-Layer Coating controls flare and ghosting. A rounded 9-blade diaphragm contributes to the lens’s smooth, pleasing bokeh quality at an angle of view of 23.3 degrees.

Autofocus is handled by Sigma’s Hyper Sonic Motor (HSM), delivering fast, quiet autofocus performance along with full-time manual focus control simply by rotating the focus ring at any time, using an internal focusing design. The lens is compatible with Sigma’s optional USB Dock for fine-tuning autofocus characteristics and updating firmware.

Build quality uses a combination of magnesium alloy and Sigma’s Thermally Stable Composite (TSC) material, allowing for reliable use across a wider range of temperatures, along with a brass bayonet mount for high precision and durability. The lens features a dust- and splash-proof structure with special sealing at the mount connection, manual focus ring, and other critical points, along with a removable, rotating Arca-type tripod foot for balanced support. It has a minimum focusing distance of 1.0m (39.4 in.), yielding a maximum magnification of 0.12x (1:8.3), and accepts a 105mm filter thread. It measures approximately 115.9mm in diameter by 155.5mm in length and weighs approximately 1,745g (61.6 oz.), reflecting its substantial, professional-grade build. The lens does not include image stabilization.

As a full-frame L-mount lens, the Sigma 105mm f/1.4 DG HSM Art delivers its full 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 157.5mm-equivalent effective field of view.

Key Features
– 105mm f/1.4 portrait-length prime lens (Art series) for Leica L-mount (full-frame)
– 17 elements in 12 groups, including 3 FLD, 2 SLD, and 1 aspherical element
– Large 105mm-diameter front element (reduced vignetting)
– Super Multi-Layer Coating
– Hyper Sonic Motor (HSM) autofocus with full-time manual focus override
– Internal focusing design
– Rounded 9-blade diaphragm
– Compatible with optional Sigma USB Dock
– Dust- and splash-proof construction
– Magnesium alloy and Thermally Stable Composite (TSC) build
– Brass bayonet mount
– Removable, rotating Arca-type tripod foot
– Minimum focusing distance of 1.0m (39.4 in.); 0.12x maximum magnification
– 105mm filter thread
– No image stabilization
– Approximate weight: 1,745g (61.6 oz.)
– Compatible with full-frame and APS-C L-mount cameras (Leica, Panasonic, Sigma)