The Sony 1.4x Teleconverter Lens multiplies the focal length of the lens used by 1.4x without degrading optical performance, AF speed and precision, or operability. Light loss with the teleconverter is approximately 1 stop. An ideal way to extend available focal length range for sports or wildlife photography without having to carry additional large, heavy lenses. Component To: Milc / Slr, Lens Structure (elements / groups): 5/6, Lens Type: Tele. Compatible Products: Sel70200gm.