Just wanted to sing praise on this lens. After a week in Africa's Kruger NP I was a happy chappy to have taken it. At 300 is is amazing, at 2.8 it is as sharp as at f4 or f5.6...just a matter of DOF. With the 2X TC attached it is the most amazing 600mm lens and on a crop body was brilliant for birding. Totally flexible with 1.4 and 2x TCs and IQ to die for. Shame that the African sun made atmospheric conditions impossible for longer shots. There will be samples posted as soon as I get chance to start PPing.


