The Sigma 300-600mm f/4 DG OS is a massive lens, in terms of both size and image quality. The Sigma 300-600mm f/4 DG OS | Sports is a lens that Sony should have made. This is an audacious lens, even for Sigma, which is one of the most innovative lens manufacturers. A fixed-aperture zoom lens … Continue reading Sigma 300-600mm F/4 DG OS | Sports Hands-on Review – a Groundbreaking Lens, With Limitations