300

This past winter I decided to purchase a 300mm f2.8 L IS.  My dream lens.  At the time I was using a 300mm f4 L IS to shoot skiing with and whilst I was never disappointed with the quality of the shots from that lens on its own, I wanted to see a little more from it when used with teleconverters. After buying the 2.8 I still had the f4 for a couple of weeks before I sold it on so I took the opportunity to shoot a few tests to compare the two.  Details of my testing were as