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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.
In photography and digital photography the lens is the part of the digital camera or video recorder that concentrates light and focuses the image. The lens itself is a single piece of glass (or other transparent materials) with one or more curved surfaces. Cameras usually contain a combination of lenses that receive light rays from an object and form an image on the focal plane.