DIY dslr fish eye lens
The lens that is use for this diy is a Nikon 18-105mm VR lens.The idea is to use the lens shield to act as an attachment for the diy fish eye lens.

DSLR fish eye lens Pic 1
Above pic show you the materials that you need to build this diy fish eye lens. If i not wrong the door viewer is about 160 degree. So remember to check the degree of the door viewer before purchasing it. Last material u need is 2 scrap particle board and some duct tape.

DSLR fish eye lens pic 2

DSLR fish eye lens pic 3
This is how it look like when you attach it to your dslr. For complete detail of how to build it can be found at instructables.
via instructables
I am always looking for a great posts. And also i am thankful to have found this!, I wish you will be adding more in the future. Thanks for making such a cool post which is really very well written.