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.
The aperture ring is the one with a bunch of numbers on it such as 2.8, 4, 5.6, 8, 11, 16, and 22.
SOURCE: Format Error message
The aperture ring must be locked in position when using automatic aperture control. When the aperture ring is in any other position the 'format error' message appears and the camera is inoperative. Now that my ring is locked in position the camera works fine.
SOURCE: Message: Lock lens aperture ring at
You must lock the aperture ring to f/22, so the camera can engage the aperture adjustment lever on the lens. Then, you can change the aperture with the command wheel.
When you change the aperture with the command wheel the aperture ring on
the lens doesn't move when the camera actually adjusts the lens
aperture.
Take the lens off and locate the aperture adjustment lever on the lens mount.
Unfortunately, this won't work with older AF lenses. So if you are using an older lens, the only thing you can do is change the camera setting to M (Manual) to adjust the aperture on the lens yourself.
That's the Nikon error message for a lens with aperture ring set to something other than the minimum (i.e. highest number).
The camera insists on controlling the aperture ring, and to do so, the ring must be set to the minimum setting.
Unless it is a "G" lens, which has no aperture ring whatsoever.
The camera body sets the aperture of the lens wide open while
auto-focusing, and displaying through the viewfinder. When it comes
time to flip the mirror up and take a picture, the camera dials the
aperture to the setting you (or the camera) have selected.
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