Leica SUPER-ELMAR-M 18 mm f/3.8 ASPH. User manual

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
Leica M or digital LEICA M8 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)
Optical design
Distance setting
Aperture
Bayonet
Filter mount/Lens hood
Dimension and weight
For 35 mm: 100°, 90°, 67° / For LEICA M8 models (18 x 27 mm): 84°, 74°, 53°
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
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
Setting/Function: With click-stops, half values available, manual diaphragm
Lowest value: 16 / Number of blades: 9
Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models
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
Length: 58 mm (2.28 in)
Largest diamater: 61 mm (2.4 in)
Weight: approx. 310 g (10.93 oz.)

LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 3
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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
_ _ _ _ _ _ _ _

LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 4
Distortion
Vignetting
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3.8
5.6
8.0
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X'[mm]
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Y'[mm]
Effective Distortion
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 illustra-
tes the appearance of straight horizontal and verti-
cal lines in the picture.
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
image height. 100% means no vignetting.

LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 5
Depth of field table
Magnification
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 - ∞ 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/∞
Distance Setting [m]
perture Stop
11 163,8 5,6 8
perture Stop 3,8
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Depth of Field [m]
Depth of Field [m]
perture Stop 5,6
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Depth of Field [m]
Depth of Field [m]

LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. 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]
perture Stop 16
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Depth of Field [m]
Depth of Field [m]
perture Stop 11
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