KOGJAERSLens Prism 79mm Handheld Kaleidoscope Lens Filter Fractal Photography for Photography Creation Repeating Themes - Perfect Photographer Gift

I had my doubts on this diopter because I've never heard of this brand, and this was my first one but it actually works as advertised. Very fun to use if you want to create artsy photos (see sample images).The handle really helps when focusing with a manual focus lens (and also pressing the shutter button). It's not comfortable but its doable. Of course its even easier with autofocus lenses.Comes with a nice pouch and cleaning cloth. Also has a threaded hole (a small one, haven't tested it) so you should be able to attatch it to a small flexible arm or tripod. Tip: On my fuji's aspc sensor it only really works well with lenses 35mm and longer focal lenghts (50mm on full frame sensor). If you want to use it on wide or ultra wide angle lenses I think you'll need the 150mm version because the 79mm one is too small to cover any significant portion of the frame.

I love jamming objects in front of a lens for character. This is no exception. While it is not a name brand, this cut glass prism works just as well as the expensive ones. I angled it In different ways a couple of inches from my lens to get really unique vignetting and lens blurs. Highly recommended.