LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
1
With its impressive angle of view of 107°, this new TRI-ELMAR conquers 16 mm super wide-angle photography in perfect Leica M
style. Due to the minimal distortion and barely perceptible field curvature, it can be recommended for highly demanding architec-
ture photography even at the 16 mm setting. Used on the digital M8, it produces the image effect of a 21 - 28 mm lens, still enab-
ling extreme wide-angle views. The ultra compact shape is achieved by two aspherical elements. A new design of the interior
focusing significantly enhances the quality in the close-focus range through an adaption of the floating element principle. Brilliant
depth of field can therefore be used from a distance of 0.33 m for hyperfocal photography. Save money by buying the lens in a set
together with the Universal Wide-angle Viewfinder M.
Lens shape 16 mm
Aspheres
Internal focussing
Vario group 1
Vario group 2
LEICA TRI-ELMAR-M 1:4/16-18-21 mm ASPH.
3
Engineering drawing
Technical Data
Angle of view (diagonal, horizontal, vertical)
for 35 mm (24 x 36 mm):
at 16 mm: 107°, 97°, 74°
at 18 mm: 100°, 90°, 67°
at 21 mm: 92°, 81°, 60°
for digital (18 x 27 mm):
at 16 mm: 90°, 80°, 59°
at 18 mm: 84°, 74°, 53°
at 21 mm: 75°, 65°, 46°, corresponds approx. to a focal length of 21/24/28 mm with 35 mm-format
Number of elements / groups: 10 / 7
Focusing range: 0.5 m to Infinity, range from 0.5 to 0.7 m separated by index
Scales: Combined meter/feet graduation with uniform grey figures below 0.7 m
Smallest object field:
Optical design
Distance setting
for 35 mm:
at 16 mm: 915 x 1373 mm, approx. 1:38
at 18 mm: 833 x 1250 mm, approx. 1:35
at 21 mm: 725 x 1087 mm, approx. 1:30
for digital:
at 16 mm: 688 x 1032 mm, approx. 1:38
at 18 mm: 626 x 939 mm, approx. 1:35
at 21 mm: 545 x 817 mm, approx. 1:30
Highest reproduction ratio: at 0,7 m
at 16 mm: 1:38
at 18 mm: 1:35
at 21 mm: 1:30
Aperture
Setting / Function: Preset, with click-stops, half values available
Lowest value: 22
Bayonet
Filter (type)
Lens hood
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
screw-on type lens hood (included in delivery),
filter holder for E67 size filters optionally available
Length: approx. 62/72 mm (with/without lens hood)
Largest diameter: approx. 54 mm (53 x 58 mm with lens hood)
Weight: approx. 335 g
Dimensions and weight
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
4
MTF graphs 16 mm
Aperture SStop 8.0
Aperture SStop 4.0
[%]
[%]
100
80
60
40
20
0
100
80
60
40
20
0
1
0
5
10
15
20
0
5
10
15
20
Y'[mm]
Y'[mm]
Aperture SStop 5.6
[%]
The MTF is indicated at full aperture and at
f/5.6 and f/8.0 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.
100
80
60
40
20
0
sagittal structures
_ _ _ _ _ _ _ _
tangential structures
0
5
10
15
20
Y'[mm]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
5
Distortion 16 mm
Effective Distortion
Relative Distortion
[%]
5
4
Y'[mm]
3
12
9
2
1
0
-1
-2
-3
-4
-5
6
3
0
0
3
6
9
12 15 18
X'[mm]
0
5
10
15
20
Y'[mm]
Vignetting 16 mm
[%]
100
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.
8.0
5.6
4.0
80
60
40
20
0
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.
0
5
10
15
20
Y'[mm]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
6
18 mm
Vignetting
Aperture SStop 4.0
[%]
[%]
100
80
60
40
20
0
100
80
60
40
20
0
8.0
5.6
4.0
0
5
5
5
10
15
20
0
5
10
15
20
Y'[mm]
Y'[mm]
Aperture SStop 5.6
Relative Distortion
[%]
[%]
100
80
60
40
20
0
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
10
15
20
0
5
10
15
20
Y'[mm]
Y'[mm]
Aperture SStop 8.0
Effective Distortion
[%]
100
80
60
40
20
0
Y'[mm]
12
9
6
3
0
0
0
10
15
20
3
6
9
12 15 18
X'[mm]
Y'[mm]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
7
21 mm
Vignetting
Aperture SStop 4.0
[%]
[%]
100
80
60
40
20
0
100
80
60
40
20
0
8.0
5.6
4.0
0
5
5
5
10
15
20
0
5
10
15
20
Y'[mm]
Y'[mm]
Aperture SStop 5.6
Relative Distortion
[%]
[%]
100
80
60
40
20
0
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
10
15
20
0
5
10
15
20
Y'[mm]
Y'[mm]
Aperture SStop 8.0
Effective Distortion
[%]
100
80
60
40
20
0
Y'[mm]
12
9
6
3
0
0
0
10
15
20
3
6
9
12 15 18
X'[mm]
Y'[mm]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
8
Depth of field table 16 mm
Aperture Stop
Magnification
4,0
5,6
8
11
16
22
0,272 - ∞
0,292 - ∞
0,307 - ∞
0,319 - ∞
0,339 - ∞
0,368 - ∞
0,385 - ∞
0,403 - ∞
0,418 - ∞
0,444 - ∞
0,5 0,426 - 0,614
0,6 0,491 - 0,786
0,403 - 0,679
0,460 - 0,904
0,511 - 1,183
0,557 - 1,542
0,638 - 2,682
0,792 - 214,2
0,899 - ∞
0,374 - 0,813
0,420 - 1,178
0,461 - 1,737
0,497 - 2,698
0,558 - 12,08
0,666 - ∞
0,344 - 1,098
0,381 - 1,963
0,413 - 4,516
0,440 - 210,2
0,484 - ∞
0,306 - 2,956
0,333 - ∞
0,355 - ∞
0,373 - ∞
0,402 - ∞
0,449 - ∞
0,476 - ∞
0,507 - ∞
0,534 - ∞
0,582 - ∞
1/25,9
1/32,
0,7
0,8
1
0,552 - 0,982
0,608 - 1,209
0,709 - 1,789
0,910 - 4,969
1,060 - 45,22
1,269 - ∞
1/38,1
1/44,3
1/56,6
1/87,2
1/118
1/179
1/302
1/∞
1,5
2
0,560 - ∞
0,737 - ∞
0,607 - ∞
3
1,041 - ∞
0,826 - ∞
0,663 - ∞
5
1,507 - ∞
1,190 - ∞
0,913 - ∞
0,715 - ∞
∞
2,093 - ∞
1,517 - ∞
1,085 - ∞
0,810 - ∞
Aperture Stop 4
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
Aperture Stop 5,6
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
9
Aperture Stop 8
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
0
0
1
1
1
2
2
2
3
3
3
4
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
Depth of Field [m]
Aperture Stop 11
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
Aperture Stop 16
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
10
Aperture Stop 22
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
11
Depth of field table 18 mm
Aperture Stop
Magnification
4,0
5,6
8
11
16
22
0,5
0,6
0,7
0,8
1
0,436 - 0,591
0,506 - 0,746
0,572 - 0,917
0,633 - 1,109
0,745 - 1,569
0,974 - 3,513
1,151 - 9,245
1,406 - ∞
0,416 - 0,639
0,478 - 0,829
0,534 - 1,054
0,586 - 1,322
0,679 - 2,058
0,859 - 7,995
0,990 - ∞
0,389 - 0,732
0,441 - 1,004
0,487 - 1,369
0,529 - 1,882
0,600 - 3,975
0,732 - ∞
0,361 - 0,901
0,404 - 1,383
0,441 - 2,240
0,473 - 4,197
0,527 - ∞
0,325 - 1,527
0,356 - 4,164
0,383 - ∞
0,406 - ∞
0,442 - ∞
0,502 - ∞
0,539 - ∞
0,581 - ∞
0,619 - ∞
0,688 - ∞
0,291 - 16,32
0,315 - ∞
0,334 - ∞
0,350 - ∞
0,375 - ∞
0,414 - ∞
0,436 - ∞
0,461 - ∞
0,483 - ∞
0,521 - ∞
1/23,6
1/29,1
1/34,7
1/40,3
1/51,4
1/79,3
1/107
1/163
1/274
1/∞
1,5
2
0,622 - ∞
0,822 - ∞
0,683 - ∞
3
1,168 - ∞
0,937 - ∞
0,757 - ∞
5
1,709 - ∞
1,364 - ∞
1,055 - ∞
0,828 - ∞
∞
2,523 - ∞
1,824 - ∞
1,299 - ∞
0,965 - ∞
Aperture Stop 4
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
Aperture Stop 5,6
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
12
Aperture Stop 8
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
0
0
1
1
1
2
2
2
3
3
3
4
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
Depth of Field [m]
Aperture Stop 11
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
Aperture Stop 16
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
13
Aperture Stop 22
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
14
Depth of field table 21 mm
Aperture Stop
Magnification
4,0
5,6
8
11
16
22
0,5 0,448 - 0,568
0,6 0,524 - 0,707
0,433 - 0,598
0,502 - 0,758
0,566 - 0,936
0,626 - 1,137
0,734 - 1,625
0,955 - 3,813
1,125 - 11,69
1,367 - ∞
0,410 - 0,656
0,470 - 0,859
0,524 - 1,102
0,574 - 1,401
0,662 - 2,259
0,831 - 12,41
0,953 - ∞
0,385 - 0,749
0,436 - 1,036
0,481 - 1,430
0,522 - 2,000
0,591 - 4,542
0,718 - ∞
0,352 - 0,993
0,391 - 1,622
0,426 - 2,968
0,455 - 7,894
0,505 - ∞
0,320 - 1,704
0,350 - 5,827
0,376 - ∞
0,398 - ∞
0,433 - ∞
0,490 - ∞
0,525 - ∞
0,565 - ∞
0,601 - ∞
0,666 - ∞
1/20,5
1/25,3
1/30,2
1/35,0
1/44,7
1/68,8
1/93,0
1/141
1/238
1/∞
0,7
0,8
1
0,595 - 0,858
0,663 - 1,020
0,788 - 1,390
1,054 - 2,690
1,268 - 5,055
1,590 - 42,08
1,996 - ∞
1,5
2
0,590 - ∞
0,804 - ∞
0,644 - ∞
3
1,117 - ∞
0,914 - ∞
0,709 - ∞
5
1,650 - ∞
1,294 - ∞
1,026 - ∞
0,771 - ∞
∞
3,232 - ∞
2,397 - ∞
1,699 - ∞
1,256 - ∞
0,887 - ∞
Aperture Stop 4
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
Aperture Stop 5,6
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
15
Aperture Stop 8
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
0
0
1
1
1
2
2
2
3
3
3
4
5
6
6
6
7
7
7
8
8
8
9
9
9
10
10
10
Depth of Field [m]
Aperture Stop 11
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
Aperture Stop 16
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
4
5
Depth of Field [m]
LEICA TRI-ELMAR-M 16-18-21 mm f/4 ASPH.
16
Aperture Stop 22
0,5
0,6
0,7
0,8
1
1,5
2
3
5
∞
0
1
2
3
4
5
6
7
8
9
10
Depth of Field [m]
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