Overview

The Sigma 300-600mm F4 DG OS Sports is a super-telephoto zoom offering a constant f/4 aperture across its range, providing versatility at a lower price than 600mm f/4 primes. Optically, it delivers beautiful image quality but is not razor-sharp at f/4 from 500-600mm and benefits from high-megapixel cameras. It features robust build, weather sealing, and extensive controls, but is heavy at nearly 4kg. Autofocus is good but trails Sony and Tamron. It suits wildlife and sports photographers seeking a versatile, bright zoom, especially L-mount users.