Thanks Gordon, Clive and Peter for taking the time to help. Unfortunately the lens has gone back as it had a very small crack in the glass within the lens. I only found this when I really scrutinised the lens because of some weird flare I got when shooting a sunset last week. All my other test shots were fine and when zoomed in shooting towards the sun it was fine too. It took some finding but I knew there must be something wrong. The chap who sold it to me on ebay has been really good about it.
In order to avoid spiralling into a "lack of L lens" depression I have signed up to a 0% on new purchases credit card and shall be checking out new 24-105 and 24-70 L's.
Incidentally, are there any rumours about a replacement 27-70 anytime soon? If there is it may knock the price of the current one down a bit.
Thanks again
Paul
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