LEICA SUMMILUX-M 28mm f/1.4 ASPH. 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 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 Floating Element Element

ASPH ASPH

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LEICA SUMMILUX-M 28mm f/1.4 ASPH. SUPER ELMAR-M 21mm f/3.4 ASPH.

Engineering drawing

Technical Data Angle of view (diagonal, horizontal, vertical) Optical design

75° / 65° / 46° (M8: 60° / 51° / 35°) Number of lenses/groups: 10 / 7 Position of entrance pupil (from bayonet flange): 31,9 mm Focus range: 0.7 m to ∞

Distance setting

Scales: Combined meter / graduation Smallest object field: 526 mm x 789 mm (M8: 395 mm x 592 mm) Largest reproduction ratio: 1 : 21,9

Aperture

Setting / Function: prefix with click-stops, half steps Lowest value: 16

Bayonet Leica M quick-change bayonet Lens hood Filter mount Dimensions and weight

External thread with stop for screw on lens hood (included) E49 Length: approx. 81 mm / 67 mm (with / without lens hood) Largest diameter: approx. 61 mm Weight: approx. 440 g

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SUMMILUX-M 1:1.4/28mm ASPH. Blende 1.4

[%] Brennweite 28 mm 100

SUMMILUX-M 1:1.4/28mm ASPH.

LEICA SUMMILUX-M 28mm f/1.4 ASPH. SUPER ELMAR-M 21mm f/3.4 ASPH. Vignettierung Blende 1.4 100

[%]

100

80

80

60

60

MTF-graphs 40

40

20

20

0 100

[%]

60

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6

f/1.4

Blende 1.4 9 12

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Y'[mm] Blende 2.8

80[%] 100

0 100

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20

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Brennweite 28 mm

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Vignettierung 9 Aperture 12 15 18 Stop f/2.8 5.6 Blende 2.8 21 [%] Y'[mm] 100 6

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40 60

2 40 1

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1812 2115 Y'[mm]

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Blende 5.6 9 12

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Y'[mm] Y‘ [mm]

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the contrast ratio for large object structures. The 203 20 and 40 lp/mm records the resolution of finer and finest object structures. 0 0 3



3

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93

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15 9

1812 2115

tangential structuresY'[mm] sagittal structures

Effektive 6 9 Verzeichnung 12 15

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X'[mm] Y'[mm] 12

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Relative 6 9 Verzeichnung 12 15 Blende18 5.6 21 [%] Y'[mm] 100

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Effektive Verzeichnung 80

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0 [%]

0 60

The MTF is indicated at full aperture, at f/2,8 and f/5,6 12 2 Y'[mm]at long taking distances (infinity). Shown is the contrast 1 60 in percentage for 5, 10, 20 and 40 lp/mm accross the9 0 12 height of the 35 mm film format, for tangential (dotted -1 40 sagittal (solid line) structures, in white light. line) and 6 -2 9 The 5 and 10 lp/mm will give an indication regarding

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f/5.6

Blende 5.6

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5.6 2.8 1.4

60 80

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Y'[mm]

Relative Verzeichnung 80

80[%] 5

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5.6 2.8 1.4

40

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[%]

80

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SUMMILUX-M 1:1.4/28mm ASPH. 0 [%]

100

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M 1:1.4/28mm ASPH.

100 80

[%]

5.6 2.8 1.4

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4

1 0 -1 -2

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-3 -4

Distortion 0 0

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Relative Distortion

Relative [%] Verzeichnung 100

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Y'[mm]

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Relative Verzeichnung

[%]

4 f/3.4 LEICA SUMMILUX-M 28mm f/1.4 ASPH. SUPER ELMAR-M 21mm ASPH. 80 3

40

18

Y'[mm]

Blende 2.8

Vignettierung [%] 100

60

15

Y'[mm]

Brennweite 28 mm

21

Y'[mm]

Effective Effektive Distortion Verzeichnung

Blende 5.6 Y'[mm]

4

80

3

12

2

60

1

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0

40

-1

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-2

20

-3

3

-4 15

18

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Y' [mm]

918

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Y'[mm] Y‘ [mm]

15

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6

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18

X'[mm] Y‘ [mm]

Effektive Verzeichnung Y'[mm] 12

Vignetting 9 6

-M 1:1.4/28mm ASPH.

Brennweite 28 mm

3

15

18

21

Y'[mm]

0 100

Vignettierung

[%]

0

3

6

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12

15

18 X'[mm]

80 60 40

f/5.6 5.6 f/2.8 2.8 f/1.4 1.4

Distortion is the deviation of the real image height (in the picture) from the ideal image height. The relative distortion is the percentage deviation. The ideal image height results from the object height and the magnification. The image height of 21.6 mm is the radial distance between the edge and the middle of the image field for the 24 mm x 36 mm format. The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture.

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Y‘ [mm] 5 4 3 2 1 0 -1

[%]

Relative Verzeichnung

Vignetting is a continous decrease of the illumination towards the edges of the image field. The graph shows the percentage lost of illumination over the image height. 100% means no vignetting.

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LEICA SUMMILUX-M 28mm f/1.4 ASPH. SUPER ELMAR-M 21mm f/3.4 ASPH. Depth of field table

Magnification Vergrößerung

2,0

2,8

4,0

5,6

8,0

11,0

16,0

0,7

0,676 - 0,726

0,668 - 0,736

0,656 - 0,751

0,639 - 0,775

0,618 - 0,811

0,589 - 0,871

0,557 - 0,961

0,511 - 1,165

1/21,9

0,8

0,769 - 0,834

0,758 - 0,848

0,742 - 0,869

0,718 - 0,903

0,692 - 0,952

0,655 - 1,038

0,615 - 1,172

0,559 - 1,503

1/25,5

1

0,950 - 1,056

0,933 - 1,079

0,908 - 1,114

0,874 - 1,172

0,833 - 1,260

0,778 - 1,422

0,719 - 1,697

0,641 - 2,529

1/32,6

1,2

1,127 - 1,284

1,102 - 1,318

1,068 - 1,378

1,020 - 1,464

0,963 - 1,607

0,889 - 1,886

0,812 - 2,419

0,711 - 4,648

1/39,6

1,5

1,386 - 1,636

1,347 - 1,694

1,295 - 1,787

1,224 - 1,948

1,141 - 2,217

1,036 - 2,802

0,931 - 4,209

0,799 - 28,68

1/50,2

2

1,798 - 2,255

1,732 - 2,370

1,645 - 2,560

1,530 - 2,913

1,400 - 3,574

1,243 - 5,448

1,092 - 16,21

0,911 -

∞

1/67,9

3

2,560 - 3,628

2,426 - 3,941

2,255 - 4,512

2,040 - 5,769

1,810 - 9,220

1,552 -

98,2

1,318 -

∞

1,060 -

∞

1/103,3

5

3,873 - 7,074

3,570 - 8,399

3,205 - 11,57

2,782 -

26,8

2,380 -

∞

1,938 -

∞

1,584 -

∞

1,219 -

∞

1/174

∞

16,78 -

12,18 -

8,714 -

6,119 -

∞

4,388 -

∞

3,089 -

∞

2,263 -

∞

1,575 -

∞

1/∞

∞

∞

∞

Aperture Stop 1,4

0,7

Distance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Depth of Field [m]

Aperture Stop 2,0

0,7 0,8 Distance Setting [m]

Distance Setting [m] [m] Eingestellte Entfernung

Aperture Stop Blende 1,4

1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5

6

7

8

9

Depth of Field [m]

10

11

12

13

14

15

16

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LEICA SUMMILUX-M SUPER ELMAR-M 21mm ASPH. LEICA 28mm f/1.4f/3.4 ASPH.

Aperture Stop 2,8

0,7

Distance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5

6

7

8

9

10

11

12

Depth of Field [m]

Aperture Stop 4,0

0,7

Distance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5 Depth of Field [m]

6

7

8

9

10

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LEICA SUPER SUMMILUX-M 28mm f/1.4 ASPH. LEICA ELMAR-M 21mm f/3.4 ASPH.

Aperture Stop 5,6

0,7

Disntance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5

6

7

8

9

10

Depth of Field [m]

Aperture Stop 8

0,7

Distance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4 Depth of Field [m]

5

6

7

8

8

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LEICA SUMMILUX-M 28mm f/1.4 ASPH. SUPER ELMAR-M 21mm f/3.4 ASPH.

Aperture Stop 11

0,7

Disntance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5

6

Depth of Field [m]

Aperture Stop 16

0,7

Distance Setting [m]

0,8 1 1,2 1,5 2 3 5 ∞ 0

1

2

3

4

5

Depth of Field [m]

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