First up, the Breakthrough Dark CPL is a combination Polarizer and Neutral density filter. It can come in 3 stop, 6 stop and 10 stop light cutting abilities. It combines the X4 filters and some new engineering that Breakthrough is pushing that goes all the way up to creating their own ND filter holders.
Meanwhile, the Breakthrough X4 GND is made of tempered glass; and so they’re touting how durable it is. Both filters have a really long guarantee and use SCHOTT glass made in Germany.
Like all the other options that they’ve talked about, they’re making claims of being the world’s sharpest and most color neutral ND filter out there.
In many ways, these are the filters that I’ve personally been waiting for from Breakthrough. The quality of their other filters is very good; and I’d even say that they’re some of the best made out there. You can surely tell the difference between filters like this and some of the more plastic options from a manufacturer like Neewer that does things rather cheaply for a quick sale on Amazon.
Visit the already fully funded Kickstarter page to get more information.