12X zoom.. 6X zoom is all relative. On a 35mm film camera... a 50mm lens is considered a normal focal length. If a lens has a smaller focal length that 50mm, then it is considered Wide angle, and longer focal length is considered Telephoto.
So if a zoom lens has a focal length range of 25mm-100mm... then it is a 4X zoom (100/25). Now if another zoom lens has a range of 50mm-200mm.... then again it is a 4X zoom... but this will obviously allow you to zoom in a lot closer....