Think about the less obvious challenges involved with getting a picture to match up with an older version of the same shot. Simply looking at an old photo does

Think about the less obvious challenges involved with getting a picture to match up with an older version of the same shot. Simply looking at an old photo does not always tell you much about the lens, focal length and aperture used, or the size of the negative. Without being able to match these with confidence, or even if you know what the match is, you may not be able to procure the necessary equipment to replicate the perspective of the shot taken with it. The old pictures were likely taken by multiple photographers for multiple occasions using a wide variety of camera/glass makes, models and formats, while a modern photojournalist compiling photos for an article will likely have access to a comparably narrow spectrum of equipment. Also it may not be possible to stand in the same place due to new construction in the position of the old shot.