Natural Sunset Color No Filters Only PL and two Nd filters 2 stop + 4 stop to Slowing the Shutter Speed to 120 sec for movement Clouds .
Technical Specs :
Camera: Canon EOS 5D
Lens: Canon EF 17-40mm f/4L USM
Focal Length: 34mm
Shutter: 120 sec
Other : on tripod + Cable Release
Filters : B+W Polarizer + 2 stop ND + 4 stop ND