Hi All,
I have a Canon 70-200 f4 L IS and its a great lens but it just does not have the reach for wildlife and some motorsport.
I have been thinking of getting the 1.4x converter but an put off by how this might slow down the autofocus on my 60D.
Over the past few days I have thought about selling the 70-200 and buying a 100-400 L. I have been doing lots of research on this lens and read mixed reports. Some people complain of dust inside the lens due to the push/pull design.
Im not too worried about f5.6 at 400mm as you can't have it all for £1200!
I like how light my 70-200 f4 is and I know the 100-400 will feel like a monster in comparison. Has anyone out there made this change or can you speak for how good the 100-400 L is?
Thanks. 





