I’m going to make a kaleidoscope, mounted on the wall and hopefully large enough for me to sit at my desk and watch. I’ve noticed that all the websites I’ve visited specify building it in a tube, but none have addressed why that’s a requirement.
I assume it’s because it aids the build, keeps it simple, and accomodates the focal length for most peoples’ eyes (for a personal, handheld device). Can anyone tell me the pitfalls of making a stubby kaleidoscope? I’m going to experiment also with tapered mirrors, so the viewing opening is much larger than the opposite end where the colorful trinkets are. I’m not worried about loss of clarity.
Also, mirrors. Front-surface mirrors are typically used to eliminate the dispersion fringe you get. In my case, that might add to the interest in the final display; I would be able to use mirror acrylic, right?
Any links or practical experience is welcome.