Originally posted by Thekillerqueen Ah i see thank you! Would there be any advantages to having that infront of another lens and using manual focus?
Unless I am missing your point, the reason for the Tele-extender is to increase the focal length of your existing lens. That comes at the penalty of reduced image quality and two stops of light. With this particular TC you also lose auto-focus.
So to answer your question if you have a 50mm f/1.8 lens auto focus lens and you add the TC you get a 100mm f/3.5 manual focus lens. That is really the only point to putting it "in front". I should add that in general usage "in front" means in front of the front of the lens. In this case I think you mean "in back" in other words between the auto focus lens and the camera.