Two heavy focus groups are rapidly and precisely positioned by separate actuators: a powerful ring ssm (super sonic wave motor) actuator for the front group, and a double linear motor actuator for the rear group. Improved positioning precision works with real-time feedback from multiple position sensors to allow the body's af system to operate at f
E-Mount Lens/Full-Frame Format Aperture Range: f/2.8 to f/22 One XA Element & Two Aspherical Elements Four ED Elements & Two Super ED Elements Nano AR Coating Dual Linear & Super Sonic Wave AF Motors Optical SteadyShot Image Stabilization Focus Hold Buttons; Focus Range Limiter Dust and Moisture-Resistant Construction Rounded 11-Blade Diaphragm