Breakthrough Photography 67mm 6-Stop Dark Circular Polarizer Filter

Breakthrough Photography is introducing a ND and CPL combination filter, which they call a 'Dark CPL'. "Stacking ND and CPL filters is a common scenario for outdoor photographers. But the primary drawback of doing this is vignetting at 16mm on a full-frame setup. By combining our X4 ND and X4 CPL into one filter - which we call a Dark CPL - we've eliminated vignetting down to 16mm on a full-frame setup. The Dark CPL is compatible with the following camera and lens systems: Leica, Carl Zeiss lenses, Schneider Xenon, Canon Cinema and L lenses, Nikon, Sony, Fuji and others.