I forgot to mention the color shift, the image get warmer when using the filter.

Also, when you screwing the filter, it doesn’t lock or even tightens like regular filter, it’s just rotates on and on, get’s harder on thread and then loosens again, that’s how it’s built. So, when you rotate the pins to control ND and CPL in the other direction than the screwing, there is also a big chance it will fall. No way to tighten it, as this is the way it’s biult.