Nikon D3100 camera lens

Okay so i'm thinking about getting the Zykkor super wide angle 0.42x but not sure if it will fit? If not what is a fisheye lens similar that will?

Stay away from any such wide angle adapter lenses. The image quality will be horrible, and you likely also get vignetting.

There's a reason why real fisheye lenses or ultra wide angle lenses cost hundreds of dollars and people gladly pay as much for them.

Buying that is a waste of money but its your money so do what you want. If you have the usual Nikon 18-55mm zoom you'll need a 52mm diameter filter - which it plainly states in the Specifications for the lens. The filter diameter is usually on the front of the lens as well.

You don't know your filter diameter and you want to buy this junk?

Spend some more time with your instruction manual and a couple of basic books. You have a fine DSLR with an excellent starter lens - learn to use them.

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