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The Sigma APO 135-400mm f/4.5-5.6 AF is a full-frame telephoto zoom lens built for Sony’s A-mount SLR and DSLR system. Covering a focal range from 135mm to 400mm with a variable maximum aperture, it addresses a practical 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 the camera body’s focus drive system, consistent with Sony A-mount lens operation, and the lens is compatible with the full range of Sony Alpha A-mount DSLR and SLT bodies as well as Minolta Maxxum A-mount film SLR bodies given the shared mount lineage between the two systems.
– 135-400mm telephoto zoom focal range
– Variable f/4.5-5.6 maximum aperture
– APO apochromatic elements for chromatic aberration control
– Autofocus via camera body drive system
– Sony A-mount compatibility
– Compatible with Sony Alpha A-mount DSLR and SLT bodies
– Compatible with Minolta Maxxum A-mount film SLR bodies
– Third-party alternative optic from Sigma
