>>4164962Variable ND's get the job done, even super cheap ones from Aliexpress or whatever. VND's don't have even coverage in-between stops, which can create subtle vignette-like dark spots. So mind the settings, if you go for a de-clicked VND. Also, cheap ones typically don't have accurate markings, so if you go that route (and I definitely think you should, because they're like $10 so if you feel like upgrading down the line, it's not much of a loss), be sure to identify where the actual stop marks are.
VND's also tend to color your images a bit. This is true for most ND's. So be sure to white balance AFTER you put it on and set its strength.
Bad filters can result in less sharp images (same goes for all filters). It's usually not particularity noticeable, but it's worth noting.
