Leica
APO-Extender-R 2x
For Leica APO Lenses
The APO-Extender-R 2x from Leica is designed for use with their R-series lenses. When in use it works to enlarge the central part of your image, effectively doubling the focal length of your lens with a two-stop loss in lens speed (a lens set to f/2.8 will become an f/5.6).
This APO-Extender is highly corrected and when used in combination with Leica's excellent R-series lenses delivers impressive performance that does not show the decline in sharpness that is noticeable with some other brands. It also maintains the fully automatic diaphragm of the lens with which it is coupled.