Nikon's mid-range 50mm prime with AF-S motor, a step up from the f/1.8G with wider aperture.
The Nikon AF-S Nikkor 50mm f/1.4G launched in 2008 as Nikon's mid-range fast standard prime. With an AF-S motor that works on all Nikon bodies and a fast f/1.4 aperture, it positioned itself between the budget f/1.8G and the premium (now discontinued) AF-S 58mm f/1.4G.
Optical quality is good with pleasant rendering from f/1.4 and excellent sharpness from f/2 onwards. Bokeh from nine rounded aperture blades is smooth and creamy. AF-S motor is quiet with full-time manual override. Build is solid at 280g.
Nikon F mount, 58mm filter thread. The AF-S 50mm f/1.8G is cheaper and nearly as sharp stopped down. The Sigma 50mm f/1.4 DG HSM Art is sharper wide open and more expensive. The Z 50mm f/1.4 is the mirrorless successor.
Moderate value used. The AF motor has a known reliability concern — test thoroughly. Check for consistent focus accuracy. The Sigma 50mm f/1.4 Art is optically superior. The Nikon is smaller and lighter. Both are good lenses.