| OBSERVACIONES | The two LEICA APO-EXTENDER-R models are both inserted between the camera and lens, and extend its focal length by a factor of 1.4 and 2 respectively. They are 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 reduces 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 LEICA APO-EXTENDER-R 1.4x, is of five-element construction and is designed for lenses with maximum apertures of 1:2.8 and below, and reduces the effective aperture by one stop. Lenses with a maximum aperture of 1:2 should therefore be stopped down by approximately one to two stops. The distinctlive protruding front element of the LEICA APO-EXTENDER-R 1.4x limits the number of usable lenses to a greater extent than the LEICA APO-EXTENDER-R 2x, as the table below shows. Both extenders offer fully automatic diaphragm operation, and are also useful aids in close-up shooting, since they not only extend the focal length by their respective factors, but also enlarge the magnification by a corresponding amount, while retaining the focusing adjustment range of the lens. |
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