Nikon's tiny budget 50mm with a screwdriver AF coupling, a classic that has lasted decades.
The Nikon AF Nikkor 50mm f/1.8D has been in production since the mid-1990s and is one of the longest-lived lenses in Nikon's catalogue. It uses Nikon's original screwdriver-type autofocus coupling which means it requires a body with a built-in AF motor. It is one of the smallest and lightest autofocus 50mm lenses ever made.
Optical quality is good with sharp results from f/2.8 onwards. Wide open at f/1.8 there is noticeable softness and some chromatic aberration. Bokeh from the seven-blade aperture is acceptable. The D designation means it communicates distance information with the body for improved metering. Build is mostly plastic but the lens feels well-made for its size.
Nikon F mount only, 52mm filter thread. The critical compatibility note: this lens will NOT autofocus on entry-level Nikon bodies without a built-in AF motor including the D3000-series, D5000-series, and D40/D60. It autofocuses on D7000-series, D500, D750, D780, D850, and all full-frame bodies. The AF-S 50mm f/1.8G replaced it with an internal motor.
Very cheap used. Check the aperture blades for oil contamination which is a common issue on older copies. Verify AF coupling engagement. If you have a body with a built-in AF motor this lens is outstanding value. Otherwise the AF-S 50mm f/1.8G is the necessary alternative.