Major specifications

Major specifications

Lens Construction

15 elements in 12 groups
(2 aspherical lenses, 1 ED lens, 2 UED lenses)

Aperture Type

9 diaphragm blades / Circular aperture diaphragm

Focusing Distance

0.2m to infinity

Filter Size


Maximum Diameter
x Overall Length

Φ70mm x Approximately 70mm


Approximately 335g

Other Feature

Dust and Splash Resistant*

The combination of a mirrorless camera with a short flange back focal length and a wide-angle lens minimizes the drawback of the asymmetrical retro-focus type lens, thereby enabling the design of advanced specifications to achieve high performance, small size and light weight.

Development intentions

• Large-aperture wide-angle lens of one class above
The LEICA DG SUMMILUX 12mm / F1.4 ASPH. is a high-performance, large-aperture lens. It is a performance-oriented lens developed to satisfy the needs and wants of photography enthusiasts. Being a single-focus lens, it offers a large diameter of F1.4, excellent image rendering capability in compliance with Leica’s optical standards, a smooth-operating aperture ring and focus ring, and a high-grade metal housing. This premium lens provides the joy of ownership. It was developed for enthusiasts who want to take pictures that are one class above.

• Wide-ranging expression
The wide angle of 24 mm in 35mm camera equivalent provides a wide angle of view and yields an image that is four times the area obtained with a standard 50mm lens. This lens is especially useful for capturing images of sweeping landscapes, night scenes and high-rise structures in a city. The lens allows the photographer to achieve unique and intended photographic expression by adjusting the camera angle and by taking advantage of perspective and deformation effects. Not only the wide angle of view but also the diversity of usage makes this large-aperture F1.4 lens very practical. It lets you take pictures in a dimly lit room or get very close to the subject to draw on the bokeh and emphasize the subject against the background to achieve a greater three-dimensional effect. You can use this lens in a variety of shooting situations.

Development intentions

MTF chart


Lens construction

F8.0, 1/13 sec, ISO 400  /  Masumi Takahashi

F8.0, 1/13 sec, ISO 400

Image rendering performance target and technologies incorporated to achieve the development goal

• Superb image rendering across the entire image field even when shooting night scenes and starry skies.
In a wide-angle lens, the shorter the focal length is, the wider the angle of view becomes, and the larger the diameter is, the lower the image rendering performance becomes due to the effect of aberrations. In previous wide-angle lenses, a negative meniscus lens was installed as the forefront lens in order to collect light from a wide angle. This results in noticeable barrel distortion and astigmatism at the same time, making the lens unsuitable for shooting night scenes or starry skies.

Panasonic solved those issues by installing a positive lens on the front, followed by a negative meniscus lens in order to eliminate the root causes of the above two aberrations. Furthermore, two large-diameter aspherical lenses, one ED(Extra-low Dispersion) lens and two UED(Ultra Extra-low Dispersion) lenses made of a special glass material are optimally arranged to suppress image surface flatness, sagittal aberration, chromatic aberration and chromatic aberration of magnification. As a result, the lens ensures superb image rendering across the entire image field even when shooting dark scenes with many point light sources, such as night scenes and starry skies.

Optimal arrangement of aspherical lenses corrects aberrations and achieves superb image rendering.

F1.4, 20 sec, ISO 1600  /  Masumi Takahashi

F1.4, 20 sec, ISO 1600

* Dust and Splash Resistant does not guarantee that damage will not occur if this lens is subjected to direct contact with dust and water.