Someone was talking here about 24fps artifacts being no problem and that they even have a supposedly hypnotising effect on the audience. This may be true but just as apiece of additional information I just wanted to mention if that person heard of tests made by the "Brainstorm" director Peter O'Fallon, where they showed the same footage to a test audience at different frame rates and measured that the physiological response reached its peak somewehere about 100fps - meaning you get a more intense experience watching a film at a higher frame rate. (This eventually led to the creation of the "Showscan"-technology). In fact the human eye can discriminate images at 200+ fps. I've tried this experiment myself with a synthetical film sequence of a 3d-flame. One in 24fps and one in 100fps. The difference is striking: with 100fps you're almost overwhelmed by realistical aspect of the sequence, it almost seems to jump out of the screen - as compared to 24fps that seem really cheap and unnatural after that.
This statement, however, concerns only frame rates, not HD vs. Film discussion, as in the meantime HD is nowhere near such extreme frame rates, whereas conventional film is.
