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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.
Point of Focus and Depth of Field. When a photographer uses the term point of focus, he is referring to that object in a photograph at which he wants to draw the most attention. Focus itself refers to the amount of the image that is sharp. Both the point of focus and the amount of focus affect the resulting image. In short, altering each one changes the look of the final photograph. In these two images, the point of focus was the same, the coneflower. However, the amount of the photo in focus, or the amount of sharpness, also called depth of field, is different. Let's deal with these subjects one at a time.