Quote Originally Posted by jrw View Post
When you put the 2x on the EF 300 you are going to like it. Focus is still really fast and while there is some softness wide open it gets better when stopped down.
I would bet he doesn't like it as much as his 500mm with the 1.4 II.
But I would like to see Joel put the 2x on his 300mm and give us his thoughts. A 300mm F/2.8 could be a good substitute for the 500mm when the weight and size of your gear is a big issue.