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Best Answer: The subject is the main object in the picture, the subject matter is the topic or context of the picture. If it is a landscape, it is the landscape itself. If it is a portrait, it is the person in the portrait. If it is a group of people playing a sport, it is the game. The subject matter is what you choose to focus on for the picture.
The depth-of-field scale (top) indicates that a subject which is anywhere between 1 and 2 meters in front of the camera will be rendered acceptably sharp. If the aperture were set to f /22 instead, everything from just over 0.7 meters almost to infinity would appear to be in focus.