Best lens for wildlife photography for the price.

I have owned this lens for 5 years now what a great lens ,from the rebel XT to the 7D my pictures are super sharp and very little aberration F5.6 has a little MTF but F7.1 is deadly .If you use the old Tamron 1.4x teleconverter (1.4x C-AF1 MC4) only, you will have auto focus and IS and you won't harm your lens,this will give you 896mm on the APS C sensor.

Problems:

Sucks dust into the camera do to the push pull zoom get a good UV filter for this lens B+W.....