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    Kenko extension tubes

    I`ve used EOS Utility before with my 100mm L macro lens and I was able to control the focussing with the computer. I have just purchased a set of Kenko automatic extension tubes and I`ve found that with them attached I can move the focus point in one direction only! Taking the tubes off and just...
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    monopods and telephoto lenses

    I am using a 5D2 and a 70-200mm f4 L IS lens with a monopod. I leave the IS switched on. Many of my pictures don`t seem to be as sharp as I expect. Any suggestions ?