Canon Lens Versus Sigma Lens For Safari

edited September 2012 Posted in » Canon Lens Talk
I am lucky enough to be going on a safari in February, and I want to compare the CANON EF 100-400MM/4.5-5.6L IS USM with a Sigma 120-400mm F4.5-5.6 DG APO OS HSM.

Any thoughts on them, particularly the motion compensation action?
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