Panasonic Leica DG Summilux 12mm f/1.4 ASPH (H-X012) is a premium wide-angle prime lens for the Micro Four Thirds system. As of late 2025, it remains one of the fastest and most optically advanced options in its class.
Key Specifications:
Focal Length: 12mm (24mm full-frame equivalent).
Aperture: f/1.4 (excellent for astrophotography and low-light shooting).
Optical Design: 15 elements in 12 groups, including 2 aspherical, 1 ED, and 2 UED lenses.
Diaphragm: 9-blade rounded aperture for smooth bokeh.
Minimum Focus Distance: 20 cm.
Weather Sealing: Dust and splash-resistant construction.
Build: All-metal barrel and hood; features a physical aperture ring (functional on Panasonic bodies only).
Pros and Cons:
Pros: Exceptional sharpness even at f/1.4, fast and silent autofocus, robust professional build quality.
Cons: No built-in stabilization (OIS), noticeable vignetting at wide apertures. The aperture ring is not functional on Olympus/OM System cameras.