FEE keeps flashing with aperture ring nikor lenses

Turn the aperture ring on the lens to its smallest setting (largest f/number). You can control the aperture from the camera body, the same was as with a lens without an aperture ring.

This is with the Sigma 24mm? If this is with the Nikon 24mm AF-D or another lens with an aperture ring then turn the aperture ring to its smallest setting (largest f/number) and control the aperture from the camera body the same way as with a lens without an aperture ring.

If it really is with the Sigma lens, try cleaning the contacts on the back of the lens and in the lens mount on the camera body.

Turn the aperture ring on the lens to its smallest setting (largest f/number). You can control the aperture from the camera body, the same way as with a lens without an aperture ring.

Leave the aperture ring on the lens at f/22. You can control the aperture from the camera body, the same way as on a lens without an aperture ring, by turning the command dial.

You need to turn the aperture ring on the lens to its smallest aperture (largest f/number) and lock it. You can control the aperture from the camera body, the same way as on lenses without an aperture ring.

FEE error message displayed on SLR camera LCD Description If the cameras LCD screen displays "FEE" in the area where the aperture is normally displayed, please ensure that the lens is attached to the camera correctly. This error message will appear if the lens is not attached correctly to the camera or if you are not using a CPU lens such as the Nikon AF or Nikkor P lenses. Alternatively, if the lens has an aperture ring, it may not be set to f22 (or the highest aperture number on the aperture ring - normally marked in orange). Select the aperture number marked in orange on the lens and lock it using the aperture locking switch to prevent this occurring again.

The FEE error message

Set to F22, or the highest aperture number - normally marked in orange. Note the locking switch.
If the above did not resolve the problem and you still experence the the error display FEE, please contact your local Nikon office. Before doing so please also check the following.

That the EE servo coupling highlighted above on the lenses has not been broken. That the F-min switch highlighted above on the camera body has not been broken. If either of the two items above are broken please contact your local Nikon service center.

Turn the aperture ring on the lens to its smallest aperture (largest f/number) and lock it. Control the aperture from the camera, just as with other lenses.

Switch to M (manual) mode.

The FEE message indicates that the lens is not set to smallest aperture (highest number). The camera body expects this so it will have full control of the aperture. It sounds like you may be accidentally bumping or turning the aperture ring on the lens while using it or changing lenses. There is a little slide lock to lock it at f/22 to prevent this. Turn the aperture ring to 22 and move the slider so the white dot is next to the orange mark on the lens barrel.

I'll offer the same answer I just gave on a D200 question: With the lens off, look at the camera mount area. If you are looking straight at the mount, there is a small tab sticking out at about 7oclock on the outside edge of the mount ring. The tab is spring loaded and may be damaged. You should be able to push the tab toward the base of the camera and it will snap back if functioning properly. If it feels loose or doesn't spring back, then switch that ab controls is not being activated.