LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 1

The LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. features a lens element with two aspherical surfaces, ensuring outstanding opti- cal performance across the image plane and at all f-stops. With the lens set to maximum aperture and mounted on a traditional or digital model, vignetting – an effect which is inherently more prevalent with super wide angle lenses – amounts to a nominal 2.3 stops or 1.7 stops on an M8. Stopping down to f/5.6 reduces the vignetting to a value of 1.3 or 1 respectively. Maximum distortion, in turn, measures only 1.8 percent and is virtually undetectable to the human eye.

Summary: The LEICA ELMAR-M 18mm f/3.8 ASPH. not only offers optimum image performance, it has compact dimensions - for its focal length - and provides all Leica M users with an economical introduction to super wide-angle photography.

Lens shape ASPH. LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 2

Engineering drawing

Technical Data Angle of view (diagonal, horizontal, vertical) For 35 mm: 100°, 90°, 67° / For LEICA M8 models (18 x 27 mm): 84°, 74°, 53° Optical design Number of lenses/groups: 8 / 7 Focal length: 18.3 mm Position of entrance pupil: 19.8 mm (related to the first lens surface in light direction) Focusing range: 0.7 m to infinity Distance setting Scales: Combined meter/feet graduation Smallest object field: 827 mm x 1241 mm (35 mm), 620 x 931 mm (LEICA M8 models) Largest reproduction ratio: 1:34.6 Aperture Setting/Function: With click-stops, half values available, manual diaphragm Lowest value: 16 / Number of blades: 9 Bayonet Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models Filter mount/Lens hood Male thread, non-rotating and with stop for filter holder or lens hood. Accessory filter holder for E77 filters available / Separate, screw-on type, included in delivery Dimension and weight Length: 58 mm (2.28 in) Largest diamater: 61 mm (2.4 in) Weight: approx. 310 g (10.93 oz.) 100 100

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100 5 4 80 3 LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 2 3 60 1 0 40 -1 -2 20 -3 -4 0 -5 MTF graphs 05101520 05101520

Aperture Stop 3.8 Aperture Stop 8.0 [%] [%] 100 100 100

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0 0 0 0 40 0 5 10 15 20 40 051015200 5 10 15 20 0369121518 Y' [mm] = 21.0 Y' [mm] = 21.0 20 20

1000 50 051015204 05101520 80 3 2 Aperture Stop 5.6 60[%] 1 100 5 0 The MTF is indicated both at full aperture and at 4 f/5.6 at long taking distances (infinity). Shown 40 -1 80 3 is the contrast in percentage for 5, 10, 20 and -2 40 lp/mm accross the height of the 35 mm film 2 20 -3 format, for tangential (dotted line) and sagittal 60 1 (solid line) structures, in white light. The 5 and -4 10 lp/mm will give an indication regarding the 0 0 -5 contrast ratio for large object structures.The 40 05101520-1 0510152020 and 40 lp/mm records the resolution of finer -2 and finest object structures. 20 -3 -4 sagittal structures ______tangential structures 1000 -5 0 5 10 15 20 05101520 80 Y' [mm] = 21.0 12 60 100 9

40 80 6 12 20 60 3 9 0 0 40 051015206 0369121518

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100 100 100 5 4 80 80 80 3 LEICA SUPER-ELMAR-M 18 mm f/3.82 ASPH. 4 60 60 60 1 0 40 40 40 -1 -2 20 20 20 -3 -4 0 Distortion0 0 -5 05101520 0510152005101520 05101520

Relative Distortion Effective Distortion [%] 100 5 100 4 Y'[mm] 80 3 80 12 2 60 1 60 9 0 40 40 -1 6 -2 20 -3 20 3 -4 0 -5 0 0 05101520 0 5 0510152010 15 20 0 3 6 9 12 15 18 Y' [mm] = 21.0 X'[mm]

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80 12 Vignetting 60 9

40 Vignetting 6[%] 100 100 Distortion is the deviation of the real image height (in the picture) from the ideal image height. The 20 3 relative distortion is the percentage deviation. 80 80 8.0 5.6 The ideal image height results from the object height and the magnification. The image height of 0 0 3.8 60 0510152060 0369121518 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 illustra- 40 40 tes the appearance of straight horizontal and verti- cal lines in the picture.

20 20 Vignetting is a continous decrease of the illumina- tion to the edges of the image field. The graph shows the percentage loss of illumination over the 0 0 image height. 100% means no vignetting. 05101520 0 5 10 15 20 Y' [mm] = 21.0

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0 0 05101520 0369121518 LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 5

Depth of field table

Aperture Stop Magnification 3,8 5,6 8 11 16 0,7 0,575 - 0,904 0,532 - 1,054 0,484 - 1,361 0,436 - 2,178 0,377 - ∞ 1/34,5 0,8 0,638 - 1,087 0,584 - 1,317 0,526 - 1,851 0,469 - 3,879 0,399 - ∞ 1/39,9 1 0,754 - 1,516 0,677 - 2,026 0,598 - 3,741 0,523 - ∞ 0,436 - ∞ 1/50,9 1,2 0,857 - 2,058 0,758 - 3,160 0,658 - 11,73 0,568 - ∞ 0,465 - ∞ 1/61,8 1,5 0,993 - 3,204 0,860 - 7,187 0,732 - ∞ 0,620 - ∞ 0,498 - ∞ 1/78,2 2 1,181 - 7,235 0,994 - ∞ 0,824 - ∞ 0,682 - ∞ 0,535 - ∞ 1/106 3 1,455 - ∞ 1,177 - ∞ 0,943 - ∞ 0,759 - ∞ 0,579 - ∞

Distance [m] Setting 1/160 5 1,788 - ∞ 1,381 - ∞ 1,065 - ∞ 0,834 - ∞ 0,619 - ∞ 1/270 ∞ 2,721 - ∞ 1,866 - ∞ 1,324 - ∞ 0,979 - ∞ 0,691 - ∞ 1/∞

Aperture Stop 3,8

0,7 0,8 1 1,2 1,5 2 3 Depth of Field[m] of Depth 5 ∞

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Aperture Stop 5,6

0,7 0,8 1 1,2 1,5 2 3 Depth of Field[m] of Depth 5 ∞

0 1 2 3 4 5 6 7 8 9 10 Depth of Field [m] LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 7

Aperture Stop 8

0,7 0,8 1 1,2 1,5 2 3 Depth of Field[m] of Depth 5 ∞

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Aperture Stop 11

0,7 0,8 1 1,2 1,5 2 3 Depth of Field[m] of Depth 5 ∞

0 1 2 3 4 5 6 7 8 9 10 Depth of Field [m]

Aperture Stop 16

0,7 0,8 1 1,2 1,5 2 3 Depth of Field[m] of Depth 5 ∞

0 1 2 3 4 5 6 7 8 9 10 Depth of Field [m]

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