Take a tape measure with you and lay it across the counter top directly in front of you, place a coin on a mark and auto focus on it with the centre focus point selected and with the lens wide open. Then check the resulting image to see if the coin is in focus and not a mark 2 cm in front of it.
I speak with sad experience - mine had to go back. I've since tried a number of others and they each displayed some auto focus problems. However, I am assured by many users that they have 10Ds that focus correctly.
My two pennyworth!
Clive
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