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SPECIAL PROPERTIES
The Leica Summilux-M 50 mm f/1.4 ASPH. offers an imaging performance
that is consistently high across almost the entire image field, and is only
re duced slightly in the extreme corners at full stop. This performance is main-
tained, even with extremely short distance settings. Stopping down leads to
a further improvement, with the optimum being reached at f/5.6. The almost
total lack of distortion should also be emphasised. The vignetting typical of
this kind of high-speed lens when fully open - up to approx. 2 stops in the
corners of the image in this case, is significantly reduced by stopping down -
to approx.
/
stop at f/5.6.
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This consistency of imaging performance over the entire image field and at
all distances represents a very visible improvement compared to the previous
model.
A total of eight individual lenses are used to achieve this performance, three
of which are made of glass types with high refractive power and two
have anomalous (partial) color dispersion - one of them is made of a fluorite-
type glass and the other of a type whose origins can be traced back to the
former Leitz glass laboratory. The concave, aspherical surface minimizes
color independent aberrations. For the first time in the Leica M system, the
Leica Summilux-M 50 mm f/1.4 ASPH. uses a „floating element" to maintain
performance in the close up range. This involves the rearmost group in the
optical system moving independently of the rest of the construction, thus
effectively preventing the otherwise inevitable spherical distortion at short
object distances.
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