The Tiffen 77mm Black Pro-Mist 1/2 Filter has been such a success for over the past 30 or so years. Its unique layering of contrast combined with a gauzy paint like halation, function as a twist on the stand of the pro halation spill effect.
Finally decided to give this filter a try. I got it because I was cutting modern Canon glass with vintage lenses for a music video. It helped a lot. Nice sun flairs. People look great with this filter. Glad I got the 1/2 strength, any more would be too much. 1/4 would be fine too I bet. Very happy with it, it makes modern lenses look better. See test pic, taken from C200 video clip.