Aperture i have a nikon D50, and a nikon 70-210mm lense attached. in the control panel screen it says top right FEE?

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.

Turn the aperture ring on the lens to its smallest setting (largest f/number) and then forget it's there. You can control the aperture from the camera body, the same way as on lenses without an aperture ring.

You need to turn the aperture ring on the lens to its smallest setting (largest f/number). You control the aperture from the camera body, the same way you've always done with lenses without an aperture ring.

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.

I hope you mean FEE.

Turn the aperture ring on the lens to its smallest setting (largest f/number). If the ring has a lock, lock it in place. You control the aperture from the camera body, just as you would on a lens with no aperture ring.

Make sure the lens aperture is manually set to the smallest setting. (i.e. the highest 'f' number).

This might be a long shot, but on the lens section of the guide shown below, it notes ,,,,

Non-G lenses will have an aperture ring on the base of the lens where it's attached to the camera. Set this this ring to the smallest aperture (largest number), usually in orange and 16, 22 or 32. There usually is a lock to keep this ring set there, since if it comes off that setting you'll get an error message (fEE) from most cameras.

Full guide is here:
http://www.kenrockwell.com/nikon/d90/users-guide/index.htm

Hope this helps

When this appears on a Nikon AF camera it means that you have not turned the aperture ring to it's minimum setting as aperture control on these works by the stop down linkage operating part way during exposure to achieve the desired setting. Some camera bodies such as the F75 control the aperture totally electronically and lack the lens throat lever needed to stop down the lens and so are not compatible with completely manual lenses.

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.