I hope it's ok to post videos on this forum. There are already many videos on youtube about DIY polarizers. I will show here a few specific tricks (smartphone polarizers, glass support, hair dryer, freezing wand, psychedelic field) and a lot of crystal growth. Crystals start at 5:31 https://www.yout...

-are the angled parts blurry just in the final stack or are they blurry too in individual layers ? -DSLR being closer to the objective as pictured should help you getting good depth of field at the expense of magnification/resolution. -250 pics for a stack sound like a lot, sometimes less is more (b...

when you stop behind the front lens, you reduce the NA (I undesrtand the NA is defined by the angle of the most outer rays), that would seem, theoretically, to be more damaging to the resolution than stopping behind the back lens. Perhaps the blur you get by stopping behind the back lens could be re...