Compact Nikon AI-S super-telephoto at 400mm f/5.6 with ED glass, manageable weight for handheld wildlife work.
The Nikon Nikkor 400mm f/5.6 IF-ED Ai-S is a super-telephoto prime for the Nikon F mount. IF = internal focus (the barrel does not extend during focusing). ED = extra-low dispersion glass. Ai-S coupling. Manual focus. Nikon F mount.
f/5.6 maximum aperture. 400mm focal length (full-frame super-telephoto). IF (internal focus). ED glass. Ai-S coupling. Manual focus. At approximately 1400g. Nikon F mount.
The Nikkor 400mm f/5.6 IF-ED provides professional super-telephoto reach with the convenience of internal focus — the compact barrel does not change length as focus is adjusted, making it easier to handle hand-held. The ED glass reduces colour fringing at 400mm.
On the used market the Nikon Nikkor 400mm f/5.6 IF-ED Ai-S is a capable vintage super-telephoto. Condition checks: front element, focus ring, Ai-S coupling. Nikon F mount — manual focus.