<p>I'm not familiar with the D60, but most all of the Nikon DSLRs have a menu option of full, 1/2 or 1/3 stops. Therefore, if you have this option set at 1/3 stop you will use the dial on the camera to cycle through the aperture range to set whatever stop you want from 1.8, 2.2,2.5,2.8,3.2,3.5,4.0, etc all the up to 22.0. I don't remember which menu, but either the custom, shooting or set-up menu should have it.</p>
<p>I hope this helps.</p>