I know what an ND filter does. I know what a polarizer does. I also know what two polarizers stacked together and rotated properly do. So the question: why should I use an ND filter to achieve a ...
As stated by @t3mujin in another thread's comments: Stacking filters will decrease image quality, as it's another piece of glass light has to go through before reaching the sensor. I was ...
If you stack two 3-stop neutral density filters, does it reduce the exposure by 6 stops or 9 stops?