Title: 2x Extender used with my 70-200 f2.8L
Review: Of all of my Canon Products I have to say that I'm disappointed with this 2x extender. With my 70-200 f2.8L I have not been able to get a clear hand held or even monopod shot. Also my autofocus on my 40D doesn't work unless I'm zoomed out first and then zoom in. I thought this would eliminate my need for a 400mm lens however this combined with arguably the best Canon lens is no replacement for a 100-400 f5.6L.Once I upgrade to a full frame camera body I'll give it another try and hope for the best.
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