As I recall the G series lenses do not have the tab to throw the lens switch (when facing the front of the camera it is the small tab on the outside of the lower left of the lens mount.) You might try moving the tab over with the lens mounted & check if the camera will work. If it works you will have to find a way to hold the switch (do not permanently jam the switch as it needs to open when the lens is removed to reset the camera's lens data). If it does not work you will need to upgrade cameras or replace the lens with an older version
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FEE error message displayed on SLR camera LCD
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.
Any of your lenses will fit on any Nikon digital SLR camera. However, there are several things to consider.
Most Nikon digital SLRs have a sensor smaller than a frame of 35mm film. This means that your lenses will give the same angle of view as a lens with a focal length 1.5 times longer. For example, your 50mm lens will give the same angle of view as a 75mm lens would. This applies to all Nikon dSLRs except the D700 and D3 series.
If the lens does not have the electronics to communicate with the camera, some dSLRs will not be able to meter with them. Of the current models, the D7000, D300s, D700, and D3 series will work.
Most old autofocus lenses will not autofocus on some dSLRs. Unless the lens is designated "AF-S" they will not autofocus on the D3000, D3100, and the older D40, D40x, and D60.
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.
This error relates to the lens not being mounted correctly
if you've got a non G-series lens
(it HAS an aperture ring), you'll get the F EE message if the lens
isn't stopped down to 22, and you're not in M mode. Also check the
contacts on the lens... make sure they're clean. Normally, the CHA
error will pop up if it's a CF card problem.
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Check to see that the lens aperture ring is set to the smallest (largest numerical) aperture setting (usually f22 or such). Nikon AF cameras have to have their lenses set at the smallest aperture for most of their program modes to work. Nikon AF lenses have a small slide or twist lock adjacent to the aperture ring to lock it in place at the smallest aperture. This may have been unlocked during the cleaning.
Another possibility is that the lens's electrical contacts were damaged during cleaning, so the body is not "seeing" the lens. Do you have another lens you could attach to the body to test this theory?
It is more likely that the tab has separated from the plate it slides on. The spring is attached to the plate with the tab sticking out from it. I have repaired these in the past by boring a small hole in the backside of the tab and use a screw to re-attach it.
If the error message is on the left hand side of your LCD monitor then your shutter is not coming on line and it might be the 'reset' switch in the back cover locking mechanism that needs replacing.
If the error message is on the right hand side of the monitor then this is because the F - stop on your lens is not set to highest setting ( 16 or 22 ) . Set your lens to highest setting and check again to see if error ( FEE ? ) disapears.
Check if the aperture is set on anything other than 22. This would generate an error message. the N50 (and other auto Nikon cameras) needs to have the lens aperture set to the smallest -- AutoFocus lenses have a lock on them to lock the aperture at the smallest. Some models, such as the N5, can be set to use either the lens' aperture ring or the camera's command dial to set the aperture, but most simpler Nikon auto cameras can only be set by the camera. Setting the lens to its smallest aperture tells the camera that it can control the lens. If the lens is set to anything else than the smallest aperture, F-- shows up on the camera's LCD, and the camera locks up. Check your camera manual for complete info.