440g
Sony has announced a compact 24-50mm F2.8G lens for its full-frame mirrorless cameras. Coming in at just 440 grams (just under 1 pound), this lens covers the most popular focal lengths for everyday shooting in a chassis 92mm (3.6") long.
Sony claims that they've made no compromises with the lens. It has an 11-blade circular aperture, uses ED and aspherical elements, and has twin linear motors for responsive and quiet focusing. Sony says that the lens can keep up with the 120 fps burst mode of its flagship a9 III.
The lens has focus, zoom, and aperture rings; the latter can be "de-clicked" for video shooting. There's also a focus hold button, whose function can be customized. The lens is dust and moisture-resistant (but not 100%, Sony points out), and the front element has a fluorine coating to fight off water and oil.
The 24-50mm F2.8G will be available in the May timeframe for a price in the $1100-$1300 range.