Leica Summaron-M 28mm 5.6 User Manual

LEICA SUMMARON-M 28 mm f/5.6

Technical Data.

Illustration 1:1

Lens Leica Summaron-M 28 mm f/5.6

Order number 11 69 5

Angle of view (diagonal, horizontal, vertical)

Optical design Number of elements/groups: 6/4

Distance setting Scala: combined meter-increments

Aperture Setting/type: preﬁx with click stops, full steps

Bayonet Leica M quick-change bayonet

Filter thread E34

Lens hood Clip-on (supplied)

Dimensions and weight Length: approx. 18/39 mm (without/with lens hood)

For 35 mm (24 x 36 mm): 75°/65°/46°

Position of entrance pupil in front of the bayonet: 2.4 mm Focusing range: 1 m to inﬁnity

Smallest object ﬁeld: for 35 mm: 801 x 1201 mm Largest reproduction ratio: 1:33.4

Smallest aperture: f/22 Number of aperture blades: 8

Largest diameter without lens hood: approx. 51 mm (without lens hood) Weight: approx. 165 g (without lens hood)

Leica Camera AG

Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com

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LEICA SUMMARON-M 28 mm f/5.6

ENGINEERING DRAWING LENS SHAPE

Illustrations 1:1

This Leica Summaron 28 mm f/5.6 is a replica of the model originally introduced in 1955. With its 6 lens elements arranged strictly symmetrically around the aperture in 4 groups, it has the same optical design. Its extremely compact mechanical construction also corresponds to the original. Unlike this, however, the current model is equipped with the M bayonet including 6 bit code. Furthermore, various external details have been adapted to the appearance of the current M lenses, for example the shape of the focus unlock button, the diameter of the aperture ring and the knurling. Even when fully open, the lens is characterized by high-contrast rendering in large areas of the field of view. Stopping down to 11 greatly improves the imaging performance in the corners of the picture. Although stopping down further enhances the picture corners even more, this is at the expense of the overall contrast, i.e. the imaging performance is more even overall. When the aperture is open, vignetting is max., i.e. in the image corners, approx. 2.5 aperture stages. By stopping down to 8 vignetting can be reduced to approx. 1.8 aperture stages. Distortion is negligible. Summary: Due to its imaging properties and its focal length, the new edition of the Leica Summaron 28 mm f/5.6 is suitable for quick and discreet photography, in other words spontaneous snapshots. Its extremely small dimensions together with the camera make an extremely manageable unit that is easy to carry.

Leica Camera AG

Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com

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Summaron-M 1:5.6/28mm Brennweite 28 mm

0 3 6 9 12 15 18 21

Y'[mm]

0

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40

60

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100

[%]

Vignettierung

5.6

8.0

11.0

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Y'[mm]

-5

-4

-3

-2

-1

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1

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5

[%]

Relative Verzeichnung

MTF DIAGRAMS

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Y'[mm]

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[%]

Blende 5.6

Summaron-M 1:5.6/28mm Brennweite 28 mm

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Y' [mm]

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[%]

Blende 8.0

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Y'[mm]

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Vignettierung

5.6

8.0

11.0

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Y'[mm]

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-4

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Relative Verzeichnung

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X'[mm]

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12

Y'[mm]

Effektive Verzeichnung

LEICA SUMMARON-M 28 mm f/5.6

[%]

100

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[%]

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Aperture Stop 5.6

Blende 5.6

Aperture Stop 8.0

Blende 8.0

Y'[mm]

Y' [mm]

Aperture Stop 11.0

[%]

Blende 11.0

100

80

60

40

20

0

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Sagittal structures

Tangential structures

Y'[mm]

MTF GRAPHS The MTF is shown in each case for the maximum aperture and the aperture value 8.0 and 11.0 for long focusing distances (infinity).

The contrast is plotted for 5, 10, 20, 40 lines/mm for the height of the format for tangential (dashed line) and sagittal structures (continuous line) for white light. The plots for 5 and 10 lines/mm provide an impression of the contrast performance for coarser object structures and the 20 and 40 lines/mm plots document the resolving power for fine and finest object structures.

Leica Camera AG

Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com

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0 3 6 9 12 15 18 21

Y'[mm]

0

20

40

60

80

100

[%]

Vignettierung

5.6

8.0

11.0

0 3 6 9 12 15 18 21

Y'[mm]

0

20

40

60

80

100

[%]

Vignettierung

5.6

8.0

11.0

0 3 6 9 12 15 18 21

Y'[mm]

-5

-4

-3

-2

-1

0

1

2

3

4

5

[%]

Relative Verzeichnung

DISTORTION

[%]

Vignettierung

LEICA SUMMARON-M 28 mm f/5.6

[%]

5

4

3

2

1

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-5 0 3 6 9 12 15 18 21

VIGNETTING

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Relative Verzeichnung

Relative Distortion

Y'[mm]

11.0

8.0

5.6

Effektive Verzeichnung

Effective Distortion

Y'[mm]

12

9

6

3

0

0 3 6 9 12 15 18

Sagittal structures

Tangential structures

X'[mm]

DISTORTION

VIGNETTING

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 format 24 mm x 36 mm. The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture.

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

Leica Camera AG

Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com

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LEICA SUMMARON-M 28 mm f/5.6

Magnification

1 0.819 - 1.290 0.765 - 1.457 0.704 - 1.763 0.622 - 2.729 0.546 - 8.185 1/33.4

1.1 0.884 - 1.464 0.821 - 1.685 0.750 - 2.111 0.657 - 3.680 0.573 - 38.45 1/36.9

1.2 0.946 - 1.649 0.874 - 1.937 0.794 - 2.527 0.690 - 5.186 0.598 - ∞ 1/40.5

1.5 1.120 - 2.287 1.020 - 2.889 0.912 - 4.457 0.776 - 51.98 0.660 - ∞ 1/51.1

1.7 1.226 - 2.796 1.106 - 3.757 0.980 - 6.958 0.824 - ∞ 0.694 - ∞ 1/58.2

2 1.373 - 3.730 1.223 - 5.678 1.070 - 18.87 0.886 - ∞ 0.736 - ∞ 1/68.8

2.5 1.587 - 6.001 1.390 - 13.50 1.194 - ∞ 0.968 - ∞ 0.791 - ∞ 1/86.5

3 1.772 - 10.10 1.529 - 164.7 1.294 - ∞ 1.032 - ∞ 0.833 - ∞ 1/104.2

5 2.310 - ∞ 1.910 - ∞ 1.555 - ∞ 1.190 - ∞ 0.931 - ∞ 1/175.1

7 2.656 - ∞ 2.139 - ∞ 1.702 - ∞ 1.273 - ∞ 0.980 - ∞ 1/246 10 2.991 - ∞ 2.351 - ∞ 1.832 - ∞ 1.343 - ∞ 1.021 - ∞ 1/352.2 20 3.508 - ∞ 2.657 - ∞ 2.011 - ∞ 1.436 - ∞ 1.073 - ∞ 1/706.5

∞ 4.242 - ∞ 3.054 - ∞ 2.230 - ∞ 1.542 - ∞ 1.130 - ∞ 1/∞

Distance Setting [m]

Aperture Stop

5.6 8.0 11.0 16.0 22.0