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Too add to the good info from Brian and John, and to confuse you a bit
Keep in mind Nikon bodies shows apparent not actual aperture. At full lens extension the aperture reading will show 2 stops smaller than it actually is. So when the Canon guys see f/11 in their display, us Nikon guys will see f/22 at full extension.
Depending on what your shooting, you might find diffraction to be acceptable all the way down to f/32 or more if you need the depth of field.