<p>I have tinkering with wordpress for years and stumbled on Indexhibit by chance and never looked back. Now I know it isn't what you asked for as it is not fullscreen. But I still can help myself in recommending it.<br />It's much faster than WP and I love the simplicity.<br />And as i detest watermarks of any sorts as they, in my opinion, take away focus from the photo I'm sticking to not uploading photos bigger than 1000px on the largest side and thus fullscreen doesn't really work for me.</p>