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The D3100 is newer, for what it's worth. It has LiveView and video capabilities.
The D3100 is intended for beginners, the D80 for more experienced users. The D3100 is easier to learn, the D80 is easier to use once you learn it. The D3100 is lighter, the D80 is more rugged.
The other major difference is that the D3100 does not have an autofocus motor, depending on the lens to have one. This means that some lenses (those not designated AF-S by Nikon) will not autofocus on the D3100 while they will on the D80.
The ultimate decision is up to you. Only you can decide which features are most important to you. Also, if you can, try to get your hands on the actual cameras. See which one feels more comfortable to you.
The 650-1300 lens does not have the electronics to communicate with the camera. You have to use it in the Manual exposure mode, without any help from the camera's light meter.
The D80 doesn't have the LiveView capability, which lets you use the LDC monitor instead of the viewfinder for framing your pictures. This has nothing to do with the lens. Nikon introduced this capability with the D3 and D300, which came out after the D80.
Are you getting a Err message? If so The ERR message is not a good thing. Read page 132 of the D80 Manual. Also, try a factory reset found on page 129 of the manual. On the left side of the camera is the terminal cover, inside below the USB connector is the reset switch. If that does not work call Nikon digital 1-800-645-6689.
- Make sure your lens is screwed on correctly. Try to remove it and put it on again.
- Make sure the dial is squarely pointed to Auto
- Make sure the Auto-Focus switch in front of the camera is turned to A (not to M)
The 50 mm lens is a full frame lens, and the D80 is a DX camera. This means that the 50mm lens puts an image out that is bigger than what the D80 can "see". The good part of this is that the D80 (and most of the other Nikon DSLR's) use only the image from the center part of an older lens. The bad part is that if you put the fisheye filter on it, the fisheye effect that is mostly seen at the edges of the lens doesn't show up on the D80 sensor. If you could put the fisheye filter on a DX lens, it would give you the full effect.
The "fEE" error indicates that the camera is not communicating with the lens. The lens may not be attached to the camera properly, or if it has an aperture ring, it may not be set to f22 (or the highest aperture number of the lens) - which is normally marked in orange. Select this aperture and lock it using the aperture locking switch to prevent this from occuring again.