The Panasonic Lumix G 14mm 2.5 lens is a pancake

Pancake lens

A pancake lens is colloquial term for a flat, thin lens , generally a normal or slightly wide prime lens for a camera. There are pancake lenses for two kinds of cameras: Compact System Camera and single-lens reflex .- Motivation :...

-style prime lens

Prime lens

In film and photography, a prime lens is either a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system....

 for Micro Four Thirds system

Micro Four Thirds system

The Micro Four Thirds system is a standard created by Olympus and Panasonic, and announced on August 5, 2008, for mirrorless interchangeable lens digital cameras and camcorders design and development...

 cameras. In the Micro Four Thirds format, it is moderately wide

Wide-angle lens

From a design perspective, a wide angle lens is one that projects a substantially larger image circle than would be typical for a standard design lens of the same focal length; this enables either large tilt & shift movements with a view camera, or lenses with wide fields of view.More informally,...

. As of its late-2010 release, it is claimed by Panasonic to be the lightest interchangeable digital-camera lens. It is the prime-lens option available with the Panasonic GF2.

Focusing is claimed to be suitable for video ("MSC"- movie and stills compatible), with a fast, quiet autofocus

Autofocus

An autofocus optical system uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication...

 motor. The lens is "focus by wire"- the focusing ring sends commands, while the actual actuation is via a motor, even for manual focus. Focusing is internal- the front lens element does not rotate, allowing the consistent use of polarized filters. The 46mm thread lets a Micro Four Thirds user share filters between it, the Panasonic 20mm

Panasonic Lumix 20mm lens

The Panasonic Lumix 20mm 1.7 lens is a pancake-style prime lens for Micro Four Thirds system cameras. In the Micro Four Thirds format, it is slightly wider than normal. It was the prime-lens option available with the GF1....

, Panasonic Leica 25mm

Panasonic Leica DG 25mm lens

The Panasonic Leica DG Summilux 25mm 1.4 lens is a normal lens for Micro Four Thirds system cameras. It is co-branded between Leica and Panasonic, built in Japan under Leica management.Focusing is internal, so polarizing filters can be used consistently...

, Panasonic Leica 45mm

Panasonic Lumix 45mm lens

The Panasonic Lumix 45mm 2.8 lens is a macro lens for Micro Four Thirds system cameras. It is co-branded between Leica and Panasonic, built in Japan under Leica management.The lens has a hardware stabilization switch...

 lenses, and the Olympus 12mm

M. Zuiko Digital ED 12mm f/2 lens

The M.Zuiko Digital ED 12 mm f/2 is a Micro Four Thirds System Prime lens by Olympus Corporation. In the Micro Four Thirds format, it is a wide- or ultra-wide lens....

.

The lens received good reviews. Reviewers liked the sharpness despite a very small size (perhaps even too small), and "silent, high speed" focusing. Criticism includes noticeable vignetting

Vignetting

In photography and optics, vignetting  is a reduction of an image's brightness or saturation at the periphery compared to the image center. The word vignette, from the same root as vine, originally referred to a decorative border in a book. Later, the word came to be used for a photographic...

, and some chromatic aberration

Chromatic aberration

In optics, chromatic aberration is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point. It occurs because lenses have a different refractive index for different wavelengths of light...

. Some reviewers criticized software correction for distortion.