The all-new, advanced optics in this camera work together to make sure whatever light you have gives you the best image possible. The custom lens uses five precision elements to shape incoming light, which makes the entire image sharper. The larger f/2.4 aperture lets in more light, so photos look brighter and better. And the advanced hybrid infrared filter keeps out harmful IR light, so you’ll see more accurate and uniform colors.
Pull out your iPhone in moonlight, candlelight, or under little white lights. Or shoot in bright light. Like at the beach. iPhone captures low-light and lots-of-light moods beautifully. So darks aren’t too dark and lights aren’t too light. Even action shots are less blurry. The next-generation backside illumination sensor is engineered with increased sensitivity and a shorter exposure time to achieve the same scene brightness — colors are less saturated and you’ll see more details. And the refined LED flash automatically kicks in when it’s needed (but you can always turn it off).
NOTE, "Its probably easier to read off of Apples website and they also have camera samples.