1) The iPhone 5s has an F2.2 aperture. Does an F2.2 aperture produce the same exposure whether its on a tiny iPhone sensor or a 35mm full frame? 2) In normal photography when you lower the F number of the aperture the image quality reduces. For example a 50mm F1.8 at F8 produces a sharper image at infinity focus than at its lowest F1.8 setting. How does this work with these tiny iphone lenses? Does quality reduce as you lower the F number ?