Nikon's budget Series E 100mm — compact telephoto portrait prime at economy pricing.
The Nikon Nikkor 100mm f/2.8 Series E Ai-S is a compact telephoto portrait prime from Nikon's economy E-series — lighter and more affordable than the AI-S Nikkor equivalents. The E-series used simpler construction to reduce cost.
Optically good — sharp from f/4 with the 100mm providing useful portrait compression. The Series E uses fewer elements and simpler coatings than premium Nikkors — but the optical quality is still very good for the price.
Nikon F mount with 52mm filter thread. Series E — lightweight economy tier. Ai-S coupling. 100mm at f/2.8 — a useful portrait and macro focal length. Compact design — lighter than equivalent AI-S Nikkors.
Available used very cheaply — the most affordable 100mm Nikkor. The Series E quality is surprisingly good despite budget positioning. For manual-focus portrait work on film or adapted mirrorless. Check for smooth operation.