hi, i've been shooting with pro35 on front of various hd cameras and one of the great things about it is the variable iris on the back of it which allows you to change exposure without changing the lens's iris and so d-o-f is not affected. for stills there is the http://www.singh-ray.com/varind.html which goes on the front of the lens. is there no variable nd that would work with red and cine lenses?
david g