The Sigma 20mm f1.4 DG DN Art is an ultra-wide prime lens designed specifically for Sony E-Mount mirrorless cameras. Featuring an exceptionally fast f1.4 maximum aperture, this Art-series lens excels in low-light conditions and astrophotography, delivering edge-to-edge sharpness with minimal optical aberrations. Constructed from 17 glass elements arranged in 15 groups with advanced aspherical optics, the lens produces detailed, high-contrast images with exceptional colour accuracy across the full frame. The weather-sealed barrel incorporates a de-clickable aperture ring for silent video operation, a Manual Focus Lock switch for secure infinity focus, and supports 82mm front filters plus a rear filter holder for creative flexibility. Made in Japan with a combination of aluminium and Thermally Stable Composite construction, this lens is ideal for landscape, architectural, and astrophotography applications.