There is a lot of terminologies that are associated with this type of technology and while you do not need to memorize all of them, you should be aware of most of them. The term “full-frame” is one of them and has not been documented as of yet. When you see a camera listed as full-frame, it means that it uses a sensor that is the same size as a single frame of a traditional 35-millimeter film. On the contrary, an APS-C sensor is much smaller. In fact, a full-frame sensor produces more than 2.5 times the surface area.