Startup Idea : Manual Exposure Panorama

Iphone exposure lock system has never worked correctly for their panorama camera option. Their design flaw is to have you touch the screen to lock exposure on a position on the screen frame,moving the camera will undoubtedly will find different brightness values for that screen position as we pan. The App should let you choose a brightness value,lock that exposure information in for the entire panorama shot regardless where you point the camera through the pan. This ruins wide panorama shots as vertically the whole section of the image goes dark as the camera passes over a brighter section of sky or landscape. As it is iPhone's exposure lock is still auto reading for that screen area. We need just lock exposure settings until the panorama shot has been completed.