Sigma's extreme super-telephoto — the 800mm f/5.6 for Canon EF professional wildlife.
The Sigma 800mm f/5.6 EX DG APO HSM is an extreme super-telephoto prime for Canon EF mount. At 800mm f/5.6, it provides extraordinary reach for wildlife and bird photography. APO elements ensure chromatic correction. HSM for quiet AF. This is one of the longest focal length AF lenses available from any third-party manufacturer.
Optical performance is good for the extreme specification. APO elements control chromatic aberration. Sharpness is acceptable — impressive given the 800mm focal length. HSM provides functional AF. The 800mm reach puts distant subjects in frame. OS is not present — body-based IS or tripod required. An extraordinary specification.
Canon EF mount. Rear drop-in filter. Weight approximately 4,900 grams — extremely heavy. Build quality professional EX grade. Tripod collar essential — gimbal recommended. The 800mm provides reach that only the most expensive Canon and Nikon super-telephotos match. No OS — a limitation at this focal length.
Rare and available at prices well below Canon/Nikon 800mm alternatives. Check AF motor, optics, and all elements. The 800mm reach at Sigma pricing — dramatically below first-party alternatives. Very heavy — requires professional support equipment. For serious wildlife photographers wanting 800mm without first-party pricing. No OS limits handheld use.