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If you're using the lens on Automatic, you need to keep it locked at F22 and set the aperture using the camera using the scroll wheels in M or A mode, rather than on the lens.
Otherwise if you want to use the aperture ring to set the aperture, you'd have to set the lens to Manual using the AF/M switch on the body at the bottom left of the lens, and again probably set the camera to M or A, although I have to admit I've never done it that way on my D90.
What camera is it you're using out of interest? I seem to think that some cameras won't allow you to set the lens to manual, so you will have to do it through the camera?
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