Panasonic/Leica's premium MFT 50mm equiv prime — f/1.4 with Leica optical quality and smooth bokeh.
The Panasonic Leica DG Summilux 25mm f/1.4 II ASPH (H-XA025) was released in 2019 as the weather-sealed revision of the original H-X025 (2011), providing a 50mm full-frame equivalent perspective on Micro Four Thirds. Nine elements in 7 groups. Seven rounded aperture blades. 46mm filter thread. At approximately 205g. 0.30m MFD.
The optical design uses 9 elements in 7 groups (2 aspherical + 1 UHR elements). Seven rounded aperture blades. The 46mm filter thread. At approximately 205g the lens is compact. Minimum focus distance of 0.30m. The mk II (H-XA025) adds splash/dust sealing and 240fps AF sensor drive compatibility over the mk I (H-X025). f/1.4 maximum aperture. MFT image circle (50mm equivalent).
The 50mm equivalent at f/1.4 provides the closest single-lens approximation to normal field of view with shallow depth of field on MFT: the f/1.4 aperture on the 25mm provides subject separation equivalent to approximately f/2.8 on full-frame at the same framing. The Leica DG branding indicates Leica optical design collaboration and Panasonic manufacturing.
On the used market the Panasonic Leica DG Summilux 25mm f/1.4 is available at mid-range MFT fast prime pricing. Condition checks: AF response, 46mm front element for marks, weather sealing (mk II). Verify mk I (H-X025) vs mk II (H-XA025) — the mk II adds weather sealing. Compatible with all Micro Four Thirds bodies.