2.0 APO-Extender-R
Product # LE11269

The LEICA 2x APO-EXTENDER-R is inserted between the camera and lens, and extends its focal length by a factor of 2. It is specially designed for use with the Leica APO lenses, so their image quality is fully retained with the extender in use, though they can also be used with various other Leica R lenses. There are number of aspects to note in this respect: The LEICA APO-EXTENDER-R 2x, constructed from seven elements in five groups, is designed for lens units with a maximum aperture of 1:2 or smaller, and they reduce the aperture by 2 f/stops. So when used with the LEICA SUMMILUX-R 50 mm f/1.4, for example, there is no increase in light compared to using a lens with a 1:2 aperture number. This means an exposure compensation of -1EV is needed, and the Summilux should be stopped down to at least to f/2.

The 2x Extender offers fully automatic diaphragm operation, and is also a useful aid in close-up shooting, since it not only extends the focal length by their respective factors, but also enlarges the magnification by a corresponding amount, while retaining the focusing adjustment range of the lens.