Peter Jackson arrived at the Comic-Con fan convention here on Saturday and wowed the crowd with 13 minutes of highly anticipated footage from the first of his two ultraexpensive “Hobbit” movies.

But he also played it safe — very safe — by not so much as mentioning, much less demonstrating, the filmmaking wizardry at the heart of the project.

Question: Have any of you ever seen a movie or any film shot at 48 fps? What's the difference? Is it so noticeable that you aren't able to be submersed in the film?