Leica Summilux-M 28mm 1.4 ASPH User Manual
LEICA SUMMILUX-M 28mm f/1.4 ASPH.
ASPH
Floating Element
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.
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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 Summilux-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 maximum of 1.1% , which is rarely noticeable in practice. A total of ten lens elements are used to achieve this exceptional
performance. To correct color defects, seven of these are made of glass types with anomalous 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
Floating Element
ASPH
LEICA SUMMILUX-M 28mm f/1.4 ASPH.
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.
Engineering drawing
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Technical Data
Angle of view (diagonal, horizontal, vertical) 75° / 65° / 46° (M8: 60° / 51° / 35°)
Optical design Number of lenses/groups: 10 / 7
Position of entrance pupil (from bayonet ange): 31,9 mm
Focus range: 0.7 m to ∞
Distance setting Scales: Combined meter / graduation
Smallestobjecteld:526 mm x 789 mm (M8: 395 mm x 592 mm)
Largest reproduction ratio: 1 : 21,9
Aperture Setting / Function: prex with click-stops, half steps
Lowest value: 16
Bayonet Leica M quick-change bayonet
Lens hood External thread with stop for screw on lens hood (included)
Filter mount E49
Dimensions and weight Length: approx. 81 mm / 67 mm (with / without lens hood)
Largest diameter: approx. 61 mm
Weight: approx. 440 g
SUMMILUX-M 1:1.4/28mm ASPH. Brennweite 28 mm
0 3 6 9 12 15 18 21
Y'[mm]
0
20
40
60
80
100
[%]
Vignettierung
1.4
2.8
5.6
0 3 6 9 12 15 18 21
Y'[mm]
0
20
40
60
80
100
[%]
Blende 1.4
SUMMILUX-M 1:1.4/28mm ASPH. Brennweite 28 mm
0 3 6 9 12 15 18 21
Y' [mm]
0
20
40
60
80
100
[%]
Blende 2.8
Y'[mm]
0 3 6 9 12 15 18 21
Y'[mm]
0
20
40
60
80
100
[%]
Vignettierung
1.4
2.8
5.6
0 3 6 9 12 15 18 21
Y'[mm]
-5
-4
-3
-2
-1
0
1
2
3
4
5
[%]
Relative Verzeichnung
0 3 6 9 12 15 18
X'[mm]
0
3
6
9
12
Y'[mm]
Effektive Verzeichnung
0 3 6 9 12 15 18 21
Y'[mm]
0
20
40
60
80
100
[%]
Blende 1.4
SUMMILUX-M 1:1.4/28mm ASPH. Brennweite 28 mm
0 3 6 9 12 15 18 21
Y' [mm]
0
20
40
60
80
100
[%]
Blende 2.8
0 3 6 9 12 15 18 21
Y'[mm]
0
20
40
60
80
100
[%]
Vignettierung
1.4
2.8
5.6
0 3 6 9 12 15 18 21
Y'[mm]
-5
-4
-3
-2
-1
0
1
2
3
4
5
[%]
Relative Verzeichnung
LEICA SUMMILUX-M 28mm f/1.4 ASPH.
LEICA SUPER ELMAR-M 21mm f/3.4 ASPH.
MTF-graphs
3
3
f/1.4
[%]
100
80
60
40
20
0
0 3 6 9 12 15 18 21
f/5.6
100
80
60
40
20
0
[%]
0 3 6 9 12 15 18 21
Blende 1.4
Blende 5.6
Y‘ [mm]
Y'[mm]
The MTF is indicated at full aperture, at f/2,8 and f/5,6
Y‘ [mm]
at long taking distances (innity). Shown is the contrast
in percentage for 5, 10, 20 and 40 lp/mm accross the
height of the 35 mm lm format, for tangential (dotted
line) and sagittal (solid line) structures, in white light.
The 5 and 10 lp/mm will give an indication regarding
the contrast ratio for large object structures. The 20
and 40 lp/mm records the resolution of ner and nest
object structures.
tangential structures
sagittal structures
Aperture Stop 5.6
f/2.8
Y‘ [mm]
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