As Nate said and I agree for a birding only lens the 400mm f/5.6 is a better lens, but more critical about suport. As a all around telephoto lens the 100-400mm is a better choice. But even for birding IS is very helpful.
John.
As Nate said and I agree for a birding only lens the 400mm f/5.6 is a better lens, but more critical about suport. As a all around telephoto lens the 100-400mm is a better choice. But even for birding IS is very helpful.
John.
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