Sony FE 400mm F2.8 GM OSS Super-Telephoto Prime Lens for Professional Sports, Wildlife & Nature Photographers: World’s Lightest Lens in its Class for Monopod or Handheld Shooting; Fast, Precise, Quiet Autofocus; Outstanding Contrast & Resolution; Natural Bokeh; Built-In Optical Stabilization with Mode 3 for Easier Tracking of Moving Subject; Dust & Moisture Resistance