I have the canon version but I haven't had any focusing issues. I think Sam has the Nikon version mabye she would know more? That is a bummer. I hope it is an easy fix!!!
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My Camera - Canon 50D - soon to own 5D Mark III 
My Lenses - 50mm 1.2, 70-200mm f4, 24-70mm 2.8, 100mm 2.8
My Software - Photoshop CS5, Lightroom 3
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