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Message: <blockquote data-quote="Wizzer650" data-source="post: 1200620" data-attributes="member: 66133">Firstly, can I say thanks to all who have posted on this thread, I found the comments invaluable whilst deciding on the above lenses.I eventually chose the Tamron & am really happy with the resulting shots. I find the lens returns good results hand-held too, if I rest against something solid. The most astonishing thing to me, is that the quality when using a 1.4X Tamron (Kenco) converter, seems nearly as sharp as without it, whilst the autofocus works right up to around the 450mm mark.I am very happy with my choice, but think that it is just down to personal preference in the end, so if you're looking to choose between the two, I would suggest that you physically handle each one, then make your choice, because on optical performance, it's really splitting hairs. I recommend that you buy either one of these lenses, it will add a whole new dimension to your photography.RegardsMark</blockquote>