Hello Guys!
Some days ago I had the same problem with my HDX900.The ND filter knob runs free without changing the filters,although the filter numbers change in the viewfinder.Unfortunately it has stopped to the ND4,making it hard to shoot into interiors.The color filter knob runs OK,although it is in the same axis.
I wonder if the ND filter knob changes the filters mechanically or electronically.
How can I remedy to this problem?
Thanks
Goshi