The system seemed to be the best compromise for the Nikkor 14-24. Mounting ring and bracket are also quite useful, and because of the size, there is also during rotation of the filter holder no vignetting. However, the color reproduction of the gray filter is unsatisfactory (in particular the 10-stop filter can also be about the color temperature no more correct).
+ Good concept + Easy installation of the filter holder - No polarization filter available - Poor color reproduction of the neutral density filter