Leica 11646 User Manual

LEICA SUMMARIT-M 90 mm f/2.5

1

The LEICA SUMMARIT-M 90 mm f/2.5 is a versatile telephoto lens that rounds off the new lens speed class of Summarit-M len­ses. Despite being much more handy and lighter than the comparable 90 mm Summicron lens, it offers outstanding optical and
mechanical quality. Even at full aperture, this lens demonstrates excellent imaging capability with outstanding contrast over the
entire image field. A slight reduction in quality can only be seen in the corners - which are not even captured by the slightly smal­ler format of the digital LEICA M8 - but even this can be improved significantly by stopping down to f/5.6.

Lens shape

LEICA SUMMARIT-M 90 mm f/2.5

2

Engineering drawing

Technical Data

Angle of view (diagonal, horizontal, vertical)

Optical design

Distance setting

Aperture

Bayonet

Filter mount /Lens hood

Dimensions and weight

For 35 mm (24 x 36 mm) : 27°, 22,6°, 15,2°, for LEICA M8 (18 x 27 mm): 20,4°, 17.1°, 11.4°,

corresponds to a focal length of approx. 120 mm with 35 mm-format

Number of lenses/groups: 5 / 4

Focal length: 91.0 mm

Position of entrance pupil: 54,8 mm (related to the first lens surface in light direction)

Focusing range: 1,0 m to endless

Scales: Combined meter/feet graduation

Smallest object field/Largest reproduction ratio:

For 35 mm, approx. 213 x 320 mm/1:8.9;

for LEICA M8, approx. 160 x 240 mm/1:8.9

Setting/Function: Preset, with click-stops, half values available

Lowest value: 16

Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models

Non-rotating, internal thread for screw-on filterssize E46, external thread for lens hood, protection

ring for external thread included in delivery, lens hood available as accessory

Length: approx. 66.5 mm

Largest diameter: approx. 55 mm

Weight: approx. 360g

LEICA SUMMARIT-M 90 mm f/2.5

3

MTF graphs

The MTF is indicated both at full aperture and at
f/5.6 at long taking distances (infinity). Shown
is the contrast in percentage for 5, 10, 20 and
40 lp/mm accross the height of the 35 mm film
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 finer
and finest object structures.

tangential structures

sagittal structures

_ _ _ _ _ _ _ _

[%]

100

80

60

40

20

0

0 5 10 15 20

[%]

100

80

60

40

20

Aperture Stop 2.5

Y' [mm] = 21.0000

Aperture Stop 4.0

[%]

100

80

60

40

20

0

0 5 10 15 20

Aperture Stop 5.6

Y' [mm] = 21.0000

0

0 5 10 15 20

Y' [mm] = 21.0000

LEICA SUMMARIT-M 90 mm f/2.5

4

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

21.6mm is the radial distance between the edge and
the middle of the image field for the format 24mm x
36mm. 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.

[%]

5

4

3

2

1

0

-1

-2

-3

-4

-5
0 5 10 15 20

[%]

100

80

60

40

20

0

0 5 10 15 20

Relative Distortion

Y' [mm] = 21.0000

Vignetting

Y' [mm] = 21.0000

5.6

4.0

2.5

Effective Distortion

Y'[mm]

12

9

6

3

0

0 3 6 9 12 15 18

X'[mm]

LEICA SUMMARIT-M 90 mm f/2.5

5

Depth of field table

Aperture Stop

5,6 8 11 162,5 2,8 4

1 0,991 - 1,009 0,990 - 1,010 0,986 - 1,015 0,980 - 1,021 0,972 - 1,030 0,962 - 1,042 0,945 - 1,062 1/8,9

1,2 1,186 - 1,214 1,185 - 1,215 1,179 - 1,222 1,171 - 1,231 1,159 - 1,244 1,144 - 1,262 1,121 - 1,292 1/11,1

1,5 1,479 - 1,522 1,477 - 1,524 1,467 - 1,535 1,454 - 1,549 1,435 - 1,571 1,412 - 1,600 1,376 - 1,649 1/14,4

2 1,962 - 2,040 1,958 - 2,044 1,941 - 2,063 1,918 - 2,090 1,885 - 2,131 1,845 - 2,184 1,782 - 2,280 1/20,0

3 2,913 - 3,092 2,905 - 3,102 2,866 - 3,147 2,816 - 3,210 2,745 - 3,309 2,660 - 3,442 2,530 - 3,689 1/31,0

5 4,762 - 5,263 4,739 - 5,292 4,636 - 5,427 4,505 - 5,619 4,322 - 5,933 4,113 - 6,380 3,807 - 7,297 1/53,0

Distance Setting [m]

10 9,087 - 11,12 8,999 - 11,250 8,632 - 11,89 8,186 - 12,85 7,597 - 14,64 6,971 - 17,73 6,130 - 27,35 1/108

∞ 98,79 - ∞ 89,21 - ∞ 62,61 - ∞ 44,79 - ∞ 31,39 - ∞ 22,85 - ∞ 15,72 - ∞ 1/∞

Aperture Stop 2,5

1

1,2

1,5

2

3

5

Distance Setting [m]

10

∞

Magnification

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

Aperture Stop 2,8

1

1,2

1,5

2

3

5

Distance Setting [m]

10

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

LEICA SUMMARIT-M 90 mm f/2.5

6

Aperture Stop 4

1

1,2

1,5

2

3

5

10

Distance Setting [m]

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

Aperture Stop 5,6

1

1,2

1,5

2

3

5

10

Distance Setting [m]

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

Aperture Stop 8

1

1,2

1,5

2

3

5

10

Distance Setting [m]

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

LEICA SUMMARIT-M 90 mm f/2.5

7

Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon [phone] / Telefax + 49 (0) 6442-208-333

www.leica-camera.com / [e-mail]

Aperture Stop 11

1

1,2

1,5

2

3

5

10

Distance Setting [m]

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]

Aperture Stop 16

1

1,2

1,5

2

3

5

10

Distance Setting [m]

∞

0 5 10 15 20 25 30 35 40 45 50

Depth of Field [m]