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Sigma produces lenses for different brands of camera's. The optics are the same, but the connection differs from brand to brand. So if you have a Sigma lens for Nikon, you won't be able to use it on a Canon or Sony. Unless you buy a adapter. But when you start using an adapter, you will lose the Af in most cases, because the electronic in the lenses differ also. and that can't be bridged.
The original DL lens was designed for non-digital application and Sigma released the DG version that was optimized for digital bodies. That said, the lens should still function to a certain extent on both and function normally on your wet film SLR.
My first suggestion would be to check the contacts on the lens and camera. Give them a good clean with a pencil eraser being careful that nothing goes inside the camera body whilst doing it.
If this fails to make any difference than the next thing would be to try the lens on a different body. The fact that the lens isn't performing correctly on two bodies leads me to think it is a lens problem but it's good to eliminate the bodies.
If this fails to make any difference then the last thing is to get it professionally looked at. Most local camera shops would do this for you. Be wary though that repair may cost more than the lens and it might be the right time to upgrade to a nice new lens to get the most out of that new DSLR!
The F-- indicates that the camera is not communicating with the lens. There are several possible reasons for this.
The lens simply lacks the electronics to communicate with the camera. Old Nikon lenses don't have the electronic circuitry for this.
The contacts aren't making contact. Try cleaning the contacts on the back of the lens and in the mount on the body. Also try jiggling the lens once it's mounted.
Either the lens or the camera (or both) are malfunctioning. Try a different lens on the camera if you can. Try the lens on a different camera if you can. It is possible that one or the other needs service.