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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.
Depth of field is a characteristic of a camera that can be used to enhance the image composition of the photo. Depth of field means the sharp area surrounding the point of focus. The magnitude of the sharp area is affected by several factors: distance between the camera and the subject, focal length and aperture.