This prime lens has a good macro (long distance) capability at 1.5 meters. Now it is even better if you add a Kenko 2x teleconverter model Kenko C-AF 2X Teleplus Pro 300 DGX. My test shows some excellent results with a Kenko 2X and Canon 7D. This makes for a great birding and macro combo in one lens. More details of my macro test here:
http://10000birds.com/bird-photography-equipment-canon-ef-300-f4-l-is-macro.htm
And super telephoto at 600mm here:
http://10000birds.com/bird-photography-equipment-teleconverters-for-7d-and-5d-miii.htm
http://10000birds.com/bird-photography-equipment-canon-ef-300-f4-l-is-macro.htm
And super telephoto at 600mm here:
http://10000birds.com/bird-photography-equipment-teleconverters-for-7d-and-5d-miii.htm