Sigma's extreme super-telephoto zoom — constant f/5.6 from 300-800mm for dedicated wildlife professionals.
The Sigma APO 300-800mm f/5.6 EX DG HSM is a super-telephoto zoom for Nikon F-mount full-frame, one of the longest and heaviest consumer telephoto zooms available. Approximately 19 elements in 15 groups. Nine aperture blades. No front filter thread — drop-in filter slot at rear. At approximately 5,860g. ~2.3m MFD. HSM autofocus.
Approximately 19 elements in 15 groups (SLD + ELD elements). Nine aperture blades. No front filter thread — drop-in filter slot only. At approximately 5,860g — requires tripod collar and heavy support. Minimum focus distance approximately 2.3m. HSM motor. f/5.6 constant aperture. Full-frame coverage (DG). Nikon F mount.
The 300-800mm range is the defining characteristic: 800mm equivalent reach covers extreme wildlife, sports, and surveillance distances inaccessible to most telephoto systems. At f/5.6 constant the lens maintains exposure throughout the zoom range. The 5,860g weight requires a substantial tripod or monopod — handheld use at 800mm is impractical. The drop-in filter system provides ND and polariser capability at this diameter.
On the used market the Sigma APO 300-800mm f/5.6 EX DG HSM is available at specialist super-telephoto pricing. Condition checks: HSM AF response, drop-in filter slot, tripod collar function, barrel for wear. Requires substantial tripod support. Compatible with Nikon F-mount FX and DX bodies.