Staff in my local branch are clueless! I went to buy my 600 f4 last month and they tried to say that they have a 2.8 version of this lens! When i said that would be the 400 they said i know nothing! I asked them to look it up and of course could not but they said that was because it was "new" - so far, still not 600 2.8 haha!
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