Turning on the iPhone camera grid makes it easier to take better pictures, here’s how to enable it:
Launch the Camera app from home screen or lock screen
Tap on “Options” at the top
Swipe Grid to “ON”
Tap “Done” to hide the Options again and return back to Camera
The grid will not appear on finalized images in the photo stream.
What’s the point? If you’re new to photography or don’t know why the grid is potentially useful, the grid makes composing images using the “rule of thirds” easier. Essentially that means by dividing a picture into horizontal and vertical thirds and placing compositional elements along those lines and intersections, you’ll end up with better pictures. It’s an old artistic technique that has been around for hundreds of years.
The animated gif shown above from Wikimedia demonstrates this well, and there is more information on Wikipedia if you want an in depth explanation of the technique and its usage in art and photography throughout history.The grid option is available only to iOS devices with a camera using iOS 5 and later.
The iPhone 4S camera system has a fifth lens and larger aperture to let more light in. 
this is repost from 9to5mac.
It is widely assumed that Apple’s next iPhone is going to be thinner and lighter than its predecessor —the 9.3mm thick iPhone 4S. However, camera modules for smartphones are not shrinking as fast as other tiny components are, and it is becoming a growing limitation when designing ultra-thin gadgets. If Apple is to engineer a thinner iPhone, the company is likely going to redesign the camera system all over again. Conveniently, Sony has a brand-new back-illuminated CMOS image sensor in the works that could be a natural fit for a next-generation iPhone.
Unveiled Monday, it separates the CMOS sensors from imaging circuitry:This image sensor layers the pixel section containing formations of back-illuminated structure pixels onto chips containing the circuit section for signal processing, which is in place of supporting substrates for conventional back-illuminated CMOS image sensors. This structure achieves further enhancement in image quality, superior functionalities and a more compact size that will lead to enhanced camera evolution.
Of course, there is no way of telling whether Apple will put the new CMOS sensor inside the next iPhone as the company famously refuses to comment on speculation. Nevertheless, Sony’s chip also benefits from the new white-light image sensors (RGBW Coding) to produce clearer images with reduced picture distortion in dark scenes and sharper videos with a wider range of light.
It also sports the HDR Movie feature that lets the camera combine two different exposures simultaneously – during video capture, one for the foreground and the other for the background. It makes a big difference in bright light situations, as seen in the below clip.
So, what’s in it for Apple?
