Best lens for sport under £400?
The 85mm f/1.8 is my go to lens when I can't use the 70-200mm for what ever reason.
It gives me a little bit of reach, is very useable in low light and will auto focus quickly. In the right distance range I get better quality images with the $400 85mm than I do with the $1800 70-200 f/2.8 IS. It is just not as versatile.
I also have a 50mm f/1.4 but it does not do sports as well as the 85mm f/1.8.