The black Panasonic LUMIX G Leica DG Summilux 15mm f/1.7 ASPH. Lens is a prime wide-angle lens designed for Micro Four Thirds sensors. Its 35mm-equivalent focal length is 30mm, making it ideally suited for everyday shooting applications. The fast f/1.7 maximum aperture benefits working in low-light conditions & also avails greater control over the focus position for shallow depth of field & selective focus techniques. Intuitive control over the aperture selection is also possible through the use of the manual aperture ring. In regard to focus, an internal focusing system with a stepping AF motor promotes fast, quiet, & smooth performance. The optical design incorporates three aspherical elements to reduce distortion & spherical aberration for sharper imagery with greater overall clarity. in addition, a Nano Surface Coating has been applied to lens elements to suppress lens flare & ghosting for more contrast-rich, color neutral photos & movies.