The Sony SAL-300F28G 300mm f/2.8 APO G SSM Lens is a professional level telephoto lens with a wide f/2.8 maximum aperture and fast SSM internal autofocusing motor. The lens has been specially designed to prevent water penetration at both ends as well as along the focus ring, while it provides more uniform sharpness across the entire image area at all apertures using high quality optical glass. AR coatings and internal baffles increase transmittance and reduce flare to preserve contrast. With thirteen finely crafted elements, three of which are Extra-low Dispersion (ED) glass elements, aberrations are closely controlled for optimal image capture.
With its internal focusing system, lens elements move to focus so that the overall length of the lens is unaffected. This provides balanced and stabilized shooting regardless of the focusing distance. Its two Direct Manual Focus (DMF) modes allow you to quickly switch between manual and autofocus, while four focus hold buttons and an electronic sliding focus range switch allow you to alter the way the lens focuses for faster and more controlled shooting.