The Pentax 20-40mm f2.8-4 DA ED Limited DC WR Lens Silver is a wide-angle zoom lens ideal for shooting a variety of subjects, including landscapes, group shots, interior work and night shots. Equipped with multi-layer HD coating, the Pentax 20-40mm lens reduces reflectance in the visible light spectrum and ensures crisp, high-contrast images with minimal flare and ghosting, even under demanding light conditions.