I need to make a peephole for my door with home materials, any ideas?

Question

I have looked it up and I only get things such as "make a new camera lens out of fish eye lens which is in door viewers, as many of you know them as. I also do not want to put it IN my door, as to there is a window on my door perfect for placing a door viewer over, just how do I make one? Please answer, I need help, and no mean answers or I will report you. Thanks

Answer 1

if you have a window, i would just go to home depot and buy a two-way mirror so you can see through, but they cant and hang it over the window.  much cheaper than building something.