Not all lenses will work on a full frame. Some lenses are designed for crop sensors. What camera do you have? Each lens company has a code on the box that will tell you if it is compatible.
These are all full frame. Full frame lenses | Lenses by type | Sony
You can use cropped sensor lenses but the camera will change and shoot 11 megapixel as it will only be using part of the sensor. So really no point.