What is the difference between these two camera lenses?

I'm just beginning to learn all about my Nikon d5000, so excuse me if this question is dumb.
I'm looking into a cheaper fisheye to take travelling, as I'm just starting out and don't want to spend the money on the nikon 10.5mm. I'm looking on amazon for the rockinon f/3.5 8mm fisheye here:

Rokinon 8mm Ultra Wide F/3.5 Fisheye Lens with Auto Aperture and Auto Exposure Chip for Nikon AE8M-N
http://www.amazon.com/...006O7158O/" class='ext_link'>http://www.amazon.com/...006O7158O/

but then noticed there was this lens:

Rokinon FE8M-N 8mm F3.5 Fisheye Lens for Nikon (Black)
http://www.amazon.com/Rokinon-Fisheye-Aperture-Exposure-AE8M-N/dp/B006O7158O/

so clearly the difference is one has an auto exposure and auto aperture chip, but i'm not really too sure what that means and if it even applies to my lower end nikon? I know this lens would be manual on my camera which is fine, but would this AE lens make a difference? I'm confused!

You have an entry level dSLR, so you need the auto-exposure and auto-aperture chip. The chip also includes an auto-focus confirm feature.

Why?

Without it, you will have no way to properly control the exposure because when you are viewing and composing your shots, the lens is wide open, yet the camera must know what lens aperture you are using in order to not overexpose your shots.

For the extra $30, you will find that lens easier to use.