How do I arrange optics to make a decent periscope? Answered
Ever since I watched the first season of Stargate SG1, I've wanted one of those sweet little tactical periscopes that Jack o'Neill uses to look around corners to avoid Jaffa. The image is here, but it's just a prop! As far as I can tell, they either don't exist or are absurdly expensive or are just really hard to find. So I want to make one. I know some basic optics from working in a university laser lab, but we don't usually use lenses and such. I have played with simple two-lens telescopes and know that the ratio of the focal lengths is the amount by which an image is magnified. The corner would need to have a tiny prism in it.
The problem I'm having is this:
If I use tiny lenses, and a longish (~30cm) tube, the viewable area is ridiculously small. I would love to find a way to enlarge the viewable area I see in the eyepiece. Does anyone here know how this is done? At the very least I would like to know how to position the optics so that it seems like my eye is at the far end of the periscope. Maybe I could use a peephole lens to get a wider field of view too.