The Sigma 170-500mm f/5-6.3 APO is a full-frame super-telephoto zoom lens built for Nikon’s F-mount SLR and DSLR system. Covering a focal range from 170mm to 500mm with a variable maximum aperture, it addresses a broad super-telephoto zoom range suited to wildlife, sports, aviation, and nature photography where extended reach from a single lens is a priority. The APO designation indicates the use of apochromatic optical elements to help control chromatic aberration and maintain color accuracy and contrast at longer focal lengths where such aberrations are more pronounced. Autofocus is handled via Nikon’s screw-drive system, requiring a camera body with a built-in focus motor for autofocus operation, while remaining fully compatible with manual focus on all F-mount bodies. A third-party alternative to first-party Nikon super-telephoto zoom lenses, offering extended reach at an accessible price point relative to comparable options in this focal range.
– 170-500mm super-telephoto zoom focal range
– Variable f/5-6.3 maximum aperture
– APO apochromatic elements for chromatic aberration control
– Autofocus via camera body screw-drive system
– Fully manual focus compatible on all F-mount bodies
– Nikon F-mount compatibility
– Full-frame coverage
– Third-party alternative optic from Sigma

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