Logo can also contain just initials "DN" instead of the full name.
Logo with a graphic could incorporate the initials "DN" or just the
"D", or possibly just an image that is film/movie/entertainment
related.
Logo should also work as a watermark on photos. Simple but stands
out.
I like the leica, and zeiss logo, potentially the
logos from film festivals or wards, frame lines from a rangefinder or
camera, exploded view of lenses, light meter or cameras, but am not
married to any of those design ideas.