Nikon Z 17-28mm f/2.8 – Compact Ultra-Wide-Angle Zoom Lens. The Nikon NIKKOR Z 17-28mm f/2.8 is a fast ultra-wide-angle zoom lens for Nikon Z-mount cameras, offering versatile shooting options with a focal length range of 17-28mm (25.5-42mm equivalent in DX format) and a constant f/2.8 aperture. Weighing only 450g and measuring 75 x 101mm, it is very small, handy, and lightweight – ideal for travel, landscape, astrophotography, or event photography. Its optical design comprises 13 elements in 11 groups, including 2 ED glass elements, 1 Super ED element, and 3 aspherical lenses, for sharp, high-contrast images with minimal aberrations. The quiet stepping motor (STM) ensures fast, precise autofocus, perfect for video, with a minimum focusing distance of 19 cm (at 17 mm). The lens is dust- and splash-proof, features a fluorine coating on the front element, and accepts a 67 mm filter thread. The 9-blade aperture (f/2.8 to f/22) delivers smooth bokeh. Despite its compact design, it offers excellent image quality and is an affordable alternative to Nikon's S-line lenses.