The Sony FE 70-200mm f/4 G OSS is a compact telephoto zoom featuring a constant f/4 maximum aperture, sophisticated G series optics, and useful AF and OSS. Two extra-low dispersion glass elements and one Super ED element help reduce chromatic aberrations and color fringing for improved clarity and color neutrality.A Nano AR coating has been applied to reduce surface reflections, flare, and ghosting for increased contrast and color rendering in strong lighting conditions.Constant f/4 maximum aperture offers consistent performance throughout the zoom range and also lends greater control over focus position for shallow depth of field techniques.Rounded nine-blade diaphragm contributes to a pleasing bokeh quality when employing selective focus techniques.Dual linear motors and an internal focus mechanism enable fast, responsive autofocus and object tracking. The lens can also focus as close as 3.3' for close up imaging.Three focus hold buttons and an AF/MF switch is present on the lens barrel for intuitive tactile control and rapid access to select settings.This stabilization system can also be combined with select camera's sensor-shift type image stabilization for more effective control of camera blur.Removable and rotating tripod collar for added stability and reducing strain on the camera's lens mount.