I recently got a sued Macro lens ( 105mm).I see a ring at the bottom of the lens closest to the camera that lists 32 to 2.8 mm in two rows one smaller print that can be rotated but only seems to work at 32. What is this for and how can I adjust it? Thanks
You apparently have not owned a lens with an aperture ring? You have to set the aperture ring to f/32 (lock it there) and control it with the camera's control wheel. The f/stops (apertures) available to you range from f/2.8 to f/32. If you use something other than Program Mode you will see what I mean.
Some digital bodies allow you to change a menu setting to enable you to use the aperture ring to set the f/stop (not sure if the d7000 will) like the older cameras for which they were built.
When Nikon first introduced their AF lenses all of them had aperture rings, just like their manual focus lenses. In 2000 Nikon introduced their first G (non-aperture ring) lens, the AF 70-300mm f4-5.6G. Since then Nikon has been converting some of their older lenses to the new G designs and now all new lens designs are G. The Tilt/Shift lenses still have aperture rings however. Nikon still makes a few of the older lenses like the AFS 17-35mm f2.8 and the AF 80-400mm VR lens with an aperture ring.
In the "old days" everything was manual. You set the speed/fstop on the camera and the aperture on the lens since aperture is actually a lens function, where speed is a camera/shutter function. In a way, it all made much more sense.