Canon's top-level supertelephoto prime lenses are some of the most impressive in the entire camera world, offering extreme focal lengths and apertures paired with uncompromising image quality and performance. The RF 400mm f/2.8L IS USM brings a sports and wildlife staple to the company's mirrorless line, and this excellent video review takes a look at the sort of image quality and performance you can expect from it in practice.
[ Read More ](Originally posted by Alex Cooke)