yes i did, i recently purchased but am still very much in the learning curve a singh-ray vari-n-duo thin mount filter, this is a circular polarizer, with an adjustable 2-8 stop nd filter outside of it, you auto focus, adjust the polarizer and then dial in the nd stops
like i said i'm still very much in the learning stage, hope to have some sunset work soon and ; good western vistas from wyoming in august