I am a bird photographer enthusiasm . I own a Canon 40D and 100-400 is f/5.6 lens. I intend to buy a new lens and hesitate between a Canon EF 70-200 f/2.8 IS USM and one EF 300 mm F/2.8 IS USM.
What do you suggest?
I shoud ad that i like to make pictures hand-held.
Thank you for your help.

