Panasonic Lumix G 15mm f/1.7 Leica DG Summilux Lens for G Series Cameras Superb image quality. The Panasonic Lumix G 15mm f/1.7 Leica DG Summilux Lens for G Series Cameras allows you to capture supreme snapshots with beautiful defocus features produced by the large, f/1.7 aperture. Bearing the world-renowned LEICA name, this lens offers exceptionally high image quality. The new lens system is comprised of 9 elements in 7 groups uses 3 aspherical lenses, which suppress aberration and distortion effectively while keeping the overall size of the lens small. In addition, this lens includes a newly-developed stepping motor, which makes focusing smooth and silent for use in both photo and video recording. With Panasonics Nano Surface technology, reflections are dramatically minimized throughout entire visual light range (380nm-780nm). Plus, you can easily and quickly control the aperture with the External Aperture Ring. Key Features: High-Precision, High-Speed AF: The inclusion of newly developed stepping motor makes the focusing action smooth and silent for use in both photo and video recording. Even better, when mounted on a LUMIX G camera, you can take advantage of high-speed, high-precision Contrast AF autofocusing. Aperture Ring Control / Metal Finish Design: This lens comes equipped with a manual aperture ring and AF/MF switch for direct, intuitive operation. In addition, the sleek metal design of this lens, including the hood, adds a touch of sophistication to your camera outfit, and warrants the LEICA name. A highly-reliable, durable metal lens mount ensures years of trouble-free use. Nano Surface Coating: With Panasonics Nano Surface technology, reflections are dramatically minimized throughout the entire visual light range (380nm-780nm) by applying an extra-low refractive index coating with nano-sized structure on the surface of the lens. It results in a super clear picture with dramatic reduction of ghost and flare.