Overview

The Nikon Nikkor 20mm f/3.5 Ai-S is a compact, all-metal manual-focus ultrawide lens praised for its smooth focus ring and small size. Optically, it offers good contrast, accurate color, and excellent flare control, even when shooting into the sun. However, corner sharpness and overall resolution are low by modern standards, and it is sharpest at close to medium distances rather than infinity. It suits photographers who value compactness, manual control, and flare resistance, and who shoot subjects like street or travel where extreme depth of field is useful.