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 compact super-telephoto prime with ED glass and internal focusing, providing genuine 400mm reach in a package lighter and smaller than the professional f/2.8 alternatives. The IF design maintains constant barrel length and balance during focusing.
The ED glass controls chromatic aberration at 400mm where colour fringing becomes problematic, and the f/5.6 aperture keeps the lens compact enough for handheld use in good light. The internal focusing design shifts only internal elements, maintaining balance on a tripod or monopod.
Build quality is premium Nikon AI-S with all-metal construction and the mechanical precision expected of Nikon's telephoto range. The lens is significantly lighter than f/2.8 and f/4 super-telephoto alternatives, making it practical for situations where the larger lenses are too heavy or conspicuous.
The Nikkor 400mm f/5.6 IF-ED offers genuine super-telephoto capability at moderate used prices and manageable weight. For wildlife and sports photographers who need 400mm reach without the bulk and cost of professional f/4 alternatives, it provides a practical and affordable solution.