The RF100-400mm f / 5.6-8 IS USM is lightweight , with a native 5.5-stop image stabilisation that can be further expanded to 6 stops when paired with a camera that is equipped with In-Body IS . Weighing a mere 635g , it is approx . 60 % lighter than the EF100-400mm f / 4.5-5.6L IS II USM .
In addition , this lens works perfectly with both the Extender RF 1.4x and RF 2x . With the ability to extend focal length up to 800mm , it is the perfect lens for wildlife photography .