Nikon's standard Ai-S 50mm f/1.8 — the full-size version, not the pancake Series E.
The Nikon Nikkor 50mm f/1.8 Ai-S is the standard-size version of Nikon's 50mm f/1.8 — distinct from the smaller Series E pancake version (ID 728). The Ai-S coupling provides full metering compatibility on all Nikon bodies with Ai coupling.
Optically good — sharp from f/4 with acceptable f/1.8 performance. Essentially the same optical formula as the Series E but in a standard-size barrel with Ai-S coupling. 5-element design. Full-frame coverage.
Nikon F mount with 52mm filter thread. Approximately 160g. Ai-S coupling for full compatibility. Metal and plastic construction. 7 aperture blades (may vary by version). Minimum focus distance 45cm.
Available used very cheaply. The Series E pancake version (ID 728) is more compact. The AF 50mm f/1.8D and AF-S 50mm f/1.8G are more practical with autofocus. For manual-focus film photography or adapted mirrorless use. Check for oil on aperture blades.