SLR camera can be installed at the same time two or more lens, is the two superimposed and then what
Therefore, SLR can only be connected directly to an optical lens for imaging, the rest of the adapter ring, telephoto lens can be superimposed on the basis of this lens, play a different effect.
Inverted lens or telephoto lens This is a special use, the real lens for optical imaging is still only one, because these special adapter ring, polarizer a variety of low-pass mirror, filter, etc. or must rely on a pure Of the optical lens to use.
Theoretically can not install multiple lenses, because the full name of the SLR is "single-lens reflective viewfinder camera", only one bayonet, that can only take a shot.
