I have always been interested in polarized light and wondered if the foldscope could be made to incorporate it. Knowing nothing about optics, I was pretty sure that the viewing situation would be too compressed for this to work…but I still wanted to try. I purchased two plastic, linear polarizing sheets from Edmonds Optics. I still need lots of practice creating and mounting crystals as well as focusing the foldscope after incorporating the polarizers, but the results were more dramatic than I expected.







Beautiful. A small recommendation.The first polarizer can be stuck to the camera lens
directly instead of between slide and lens. You can also stick it to the foldscope between the lenses of the foldscope and camera. By increasing the distance between sample and lens you are losing focus depth. I suspect this is why you lost on focus. Further I usually stick the second one to this light source. With that you can control rotation. I have never had to remove the light source for my polarizing foldscopy.. Hope to see more.