12-12-2017, 09:05 AM
The variable ND filters basically are two polarizers which are crossed in the orientation of their polarization when fully closed. Like you, I also thought "why getting specific ones with several ND steps, but instead one for all occassions?"
Maybe the one I chose is of lesser quality (the "big brands" like B&W, Hoya, Cokin, Lee or Format Hitech don't offer them afaik), but there's a big colordrift the more I close it.
Color drifts can also be an issue with bigger stoppers. I was not doing more research into it, but I wonder if the big stoppers sometimes just stop the (for humans) visible light but let pass the infrared range. I'm also looking forward to the answers of the other members, as I'd like to biy a good "big stopper" but not spend a lot of money to one with color drift (Formatt hitech in my case, they have 150×150 mm sizes)
Maybe the one I chose is of lesser quality (the "big brands" like B&W, Hoya, Cokin, Lee or Format Hitech don't offer them afaik), but there's a big colordrift the more I close it.
Color drifts can also be an issue with bigger stoppers. I was not doing more research into it, but I wonder if the big stoppers sometimes just stop the (for humans) visible light but let pass the infrared range. I'm also looking forward to the answers of the other members, as I'd like to biy a good "big stopper" but not spend a lot of money to one with color drift (Formatt hitech in my case, they have 150×150 mm sizes)