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Basic Concepts
What you see is not necessarily what you get. Cameras seem to promise that it will be, but it’s never completely true, and the picture can often differ radically from what you saw.
We’ve already hinted at some of the differences between what the eye sees and what the camera sees, like the two ‘missing’ dimensions of depth and time. These apply equally to drawing or painting, but there are some other more specifically photographic factors.
Sometimes the camera will see more than you do. Sometimes it will see less. Sometimes it will see differently. And sometimes it will do all three! Today, with digital cameras, it’s much easier to compare what we saw with what the camera recorded. It really is worth looking attentively at those playback images, especially with important shots, to see how they measure up. For one thing, if they don’t look quite how you wanted, you may be able to do something slightly differently and shoot again. For another, it all helps to build up an understanding of how the camera sees.