Since I am also interested in this lens I copied your image and ran it through DxO Optics. I increased sharpness and lowered the mid-range curve a bit. I like it as I see more detail in the frogs back but more importantly I wanted to see if I could correct some of the lens shortfalls and I think I have even though I do not have the module for the 7D and 70-300 DO installed.


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