Follow live: Sigma 28-45mm f/1.8 FE lens announcement!SonyAlphaRumors (3 days ago) - At 13:00 London time Sigma will announce the world’s first Full Frame autofocus zoom lens with constant f/1.8 aperture! Sigma 28-45mm f/1.8 preorders links: In USA at Amazon, Bhphoto, Adorama. in EU at FotoErhardt, Calumet, WexUK. ...