10 out of 10 points and recommended
First i had a Sigma 50-500 using with Sony a mounth. now i use canon D7 with this fantastic verry fast lens together with the X 2 extender .The difference is large.reviewed February 29th, 2012 (purchased for $8,580)
it is worth the money!
10 out of 10 points and recommendednot too heavy for walking in the forest
not too heavy for walking in the forest ,even with the extender. With extender monopod recommended.reviewed February 29th, 2012 (purchased for $2,350)
Verry fast and sharp AF even with the extender X2.
Used for nature and close ups.