YN-EF 2X III Type Teleconverter Extender Brand YONGNUO Model YN-EF 2X III The Magnification: 2 times Coating: multi coating Lens composition: 9 elements in 5 groups Color White Keywords Yongnuo YN-2.0X III PRO 2x Teleconverter Extender Product Name Yongnuo YN-EF 2X III Teleconverter Extender Pa...
The Canon EF 200-400/4L IS USM Extender already has an excellent built-in 1.4x extender, however you can add a second extender such as Canon's EF1.4x III and 2x III. Obviously there's point in adding the 1.4x III to the lens with the built in extender out of the optical path to...