The dedicated Leica 2x APO Extender-R (also known as a teleconverter) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with the 280mm f/2.8 APO lens will effectively increase the focal length to 560mm. A lens set to f/2.8 will now be f/5.6.
| Magnification | 2x |
| Lens Elements/Groups | 7/5 |
| Length | 1.4" (35mm) |
| Diameter | 2.7" (70mm) |
| Weight | 9.5 oz (270 g) |