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If you really need to get close then you're going to be better off with a macro lens.
You're option for removing DoF could always be to add some blur in post processing.
Which lens have you been using? You could try the 75-200 at the long end with the aperture as wide as it'll go. Try getting as close as you can before you stop being able to focus on the leaf and crop later if it's not big enough.
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