National Geographic : 1990 Jan
v far the camera was tilted or down. An exact center nt is found by drawing aonals from the corners (left and diagrams at bottom). Next the focal length of the lens must be known to find the angle between the sun and the camera axis, and between the sun and horizon. With the help of the Eastman Kodak Company, the Foundation determined that Peary used a Number 4 Folding Kodak with a focal length of 6.74 inches. The rest is mathematics. Five equations determine the relationships between these CAMERA AXIS ------------ VP i r" U- .' . .in-... ;-"1-~i,~ ::~ " ~i~ -- I--- "