Framing and preview modes.

Sony gives you two ways to enjoy Live Preview of the scene. Framing Mode presents a bright, high-contrast picture that maximizes your ability to determine who and what is in the frame. Preview Mode not only "stops down" the lens but also adjusts the shutter to show you the effect of your exposure settings in real time.

Now you can actually see the effect of aperture, shutter speed, white balance and ISO. So you can make adjustments before you take the shot, not after! You simply can't do that with an optical viewfinder.