Panasonic Leica DG Summilux 9mm f/1.7 ASPH Lens

The Panasonic Leica DG Summilux 9mm f/1.7 ASPH Lens is a fast, ultra-wide-angle prime lens designed for Micro Four Thirds mirrorless cameras, manufactured to Leica’s strict quality standards. Delivering an 18mm full-frame-equivalent focal length with a 100-degree angle of view, it’s well suited to architecture, landscapes, astrophotography, nature, environmental portraits, and filmmaking.

Optically, the lens is built from 12 elements in 9 groups, including two aspherical elements, two ED (Extra-Low Dispersion) elements, and one UHR (Ultra High Refractive Index) element, working together to effectively suppress both axial chromatic aberration and chromatic aberration of magnification while keeping the lens’s overall size compact. The bright f/1.7 maximum aperture is well suited to low-light photography, and a 7-blade circular aperture diaphragm contributes to smooth, pleasing bokeh.

A standout feature is the lens’s half-macro close-focusing capability, with a minimum focus distance of just 0.095m (0.31 ft.), yielding a maximum magnification of 0.25x (0.5x 35mm-equivalent), an unusually close working distance for an ultra-wide prime. Autofocus uses an internal focusing (IF) linear motor, delivering fast, accurate, and virtually silent performance well suited to both photo and video work, with a mechanism specifically designed to suppress focus breathing, a common issue in lenses built primarily for stills photography. Because the front element does not rotate during focus, the lens is convenient to use with polarizing or graduated neutral density filters, and smooth, micro-step aperture control supports gradual, cinematic exposure changes during video recording.

Build quality includes a splash-, dust-, and freeze-resistant design rated for operation in temperatures down to -10°C (14°F), along with a metal lens mount; the focusing ring, barrel, and non-rotating 55mm filter threads are composite plastic. The lens does not include optical image stabilization, consistent with its wide-angle design where stabilization is less critical. It’s remarkably compact and lightweight, measuring approximately 60.8mm in diameter by 52.0mm in length and weighing just 130g (0.29 lb.).

As a Micro Four Thirds-specific lens, the Leica DG Summilux 9mm f/1.7 ASPH is designed exclusively for Micro Four Thirds mirrorless cameras from Panasonic, Olympus/OM System, and other Micro Four Thirds alliance manufacturers.

Key Features
– 9mm f/1.7 ultra-wide-angle prime lens for Micro Four Thirds
– Approximately 18mm full-frame-equivalent focal length; 100° angle of view
– 12 elements in 9 groups, including 2 aspherical, 2 ED, and 1 UHR element
– Half-macro close focusing (0.095m minimum distance; 0.25x/0.5x magnification)
– Internal focusing (IF) linear motor autofocus
– Focus breathing suppression for video
– Smooth, micro-step aperture control
– 7-blade circular aperture diaphragm
– Non-rotating front element (filter- and polarizer-friendly)
– Splash-, dust-, and freeze-resistant construction (down to -10°C/14°F)
– Metal lens mount
– No optical image stabilization
– 55mm filter thread
– Ultra-compact, lightweight design (approximately 130g)
– Compatible with Micro Four Thirds mirrorless cameras (Panasonic, Olympus/OM System, and alliance partners)