Nikon vs Nikon AE lens for Nikon D5100?

I recently ordered a Rokinon 8mm f3.5 fisheye for my Nikon D5100, I received the lens today but I noticed in the instructions it was talking about film cameras. On Amazon, there's a choice between Nikon and Nikon AE, should I return my lens to get the Nikon AE? Which is best for a DSLR? They are both manual but I honestly have no idea!

AE is a Rokinon term, and I believe it stands for "Auto Exposure" - so it has the chip for communicating with the camera.

This is probably the lens you want, as although you will have to use manual focus, the exposure should work with your camera's system. If the lens does not have AE, you will have to switch to manual exposure as well as manual focus.

At any rate, since the "AE" lens is more expensive, it probably means it is more compatible…

He's right, the AE lens includes a chip which allows your D5100's exposure meter to work.

With the lens you have, it will fit, but you'll have to set your exposure manually, either by guesswork or a hand-held meter.