Wow, here’s a really innovative way to convert your Nikon DSLR into a fish-eye camera that can take some really awesome lookin’ photos.
I got the inspiration to do this Instructable while reading another Instructable that accomplished the same “fish-eye” effect using a PVC reduction pipe and an entry door viewer.
There was concern in the prior Instructable about around scratching the lens so I wanted to solve that problem in my easy to build fish eye lens as well as make a version which is easy to use, remove, etc.
I decided to modify the design