Sigma 200mm f/2 DG OS Sports Lens for Sony E-Mount

HLA (High - response Linear Actuator) Optical Stabilization algorithm OS2 NPC (Nano Porous Coating) Water - and Oil - Repellent Coating Aperture ring Aperture ring click switch Aperture ring lock switch AFL button (3 locations) 1 Focus Mode switch OS switch Focus Limiter switch Custom Mode switch Dust - and Splash - Resistant Structure Mount Conversion Service available Support for switching between linear and non - linear focus ring settings (for L - Mount only) 2 Compatible with Sigma U SB Dock UD - 11 (sold separately / for L - Mount only) Every single lens undergoes Sigma’s proprietary MTF measuring system