With its unusual build and unfathomable focal length, the Canon EF 1200mm f/5.6 L USM is anything but conventional. So, how does it perform and just how far can it be pushed? We took the lens to The Mall in London to put it through it paces and to see what Buckingham Palace looks like at 1200mm and beyond.
That lens is utterly insane. They even push it to 2400mm using converters.