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ManualsBrandsLeica ManualsLensesSummilux-M 28mm f/1.4 ASPH. Lens
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LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.
The Leica Summilux-M 28mm f/1.4 ASPH. rounds off the range of high-speed M wide angle focal lengths. It offers exce
lent image performance over the entire image field even at full aperture and in the close-up range thanks to a „floating
element“. With its exceptional contrast, the lens delivers the same recognized high performance level as the Leica Sum-
milux-M 35mm f/1.4 ASPH., and in some respects actually outperforms it. The vignetting that is typical of every optical
system is naturally more defined on a wide angle lens, particularly a high speed one like this, than on standard lenses
or those with a long focal length. At full aperture in 35mm format it is a maximum, i.e. in the corners of the image, of
around 3.4 stops, around 2 stops on Leica M8 models with their slightly smaller format. Stopping down to 5.6 visibly
reduces this light falloff – to 1.8 and 0.8 stops respectively. Stopping down further does not bring about any notable
reduction as essentially only the natural vignetting remains. Distortion is extremely low for a wide angle lens at a maxi-
mum of 1.1% (pulvinate), which is rarely noticeable in practice. A total of ten lens elements are used to achieve this ex-
ceptional performance. To correct color defects, seven of these are made of glass types with anomalous color dispersion
(partial dispersion), while one has an aspherical surface. To maintain performance in the close-up range, one element
towards the rear of the optical system is a “floating element” that moves independently of the rest of the mechanism.
Summary: The Leica Summilux-M 28mm f/1.4 ASPH. offers maximum image performance with a focal length / speed
combination previously unavailable in the M system. This extends the composition options of M photography, particulaly
for available light shots, but also thanks to a previously unattainable reduction in the depth of field combined with large
field angles.
Optical design
1
LEICA SUMMILUX-M 28mm f/1.4 ASPH.
Floating Element
ASPH
Aspherical surface
Floating Element
Floating Element
ASPH

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