Sophisticated optics, including an ultra low dispersion (UD) lens element, ensure great image quality with high contrast and resolution throughout the zoom range, even in tough shooting conditions.
Improved Image Stabilizer
The Image Stabilizer in EF 70-300mm f/4-5.6 IS II USM reduces camera shake by up to 4-stops, allowing you to use a shutter speed 4 stops slower than you would otherwise have to use in order to achieve a sharp shot.