View it in full size, tack sharp , it is not the Lens who do not make good bird photo, it´s the photographer , but I am working at it , and take care of all posiblity , tripod , head , wind , vibration , excetrera. I will find it
You only have to look athttp://www.suesbirdphotos.co.uk/bird_species.htm to se what the Lens can do.