I need a fisheye lens for my D3100

Okay. I've searched and searched and searched. All I want Is a nice-quality fisheye lens OR adapter. I have a Nikon D3100.
I already know that Nikon has a NIKKOR 10.5 lens… But it's like $750. I want something under $500.
An adapter is fine but I want it to be nice quality and AF.

Please help me out. I'll give you points. (Whatever that means) lol.

I don't think you will get the AF for a new fisheye.

You can get the Vivitar 7mm fisheye for around $330, but it's a manual focus lens.

But remember, a fisheye lens has such a wide angle of view, the depth of field is very large, so it will be fairly easy to get a photo in focus with MF.

Of course you want a fisheye, after all those are still trendy.

http://www.bhphotovideo.com/...f_3_5.html

which is all manual

http://www.bhphotovideo.com/...X_107.html

which is manual focus. Now, given the DoF you'll be working with manual focus is not a big problem with a fish.