Leica SUMMILUX-M 35 mm f/1.4 ASPH. User manual

LEICA SUMMILUX-M 24 mm f/1.4 ASPH. 1
The LEICA SUMMILUX-M 24mm f/1.4 ASPH extends Leica's series of high speed M lenses into the wide-angle range.
It offers excellent performance over the entire image field even at full stop and in the close-up range thanks to a "floating ele-
ment". Stopping down to 2.8 leads to an absolutely outstanding image quality, in fact, in comparison to the Elmarit lens of the
same focal length, its rendition is slightly more uniform across the image field. The vignetting typical of every optical system is
naturally more apparent with a super wide angle lens, particularly a high speed one like this, than on standard lenses or those
with a long focal length. At full stop with the 35mm format, its maximum - i.e. in the corners of the image - is around 3.3 aperture
stops or, with the Leica M8 models and their slightly smaller format, around 1.9 aperture stops. Stopping down to 2.8 visibly
reduces this light fall-off towards the image edges to 1.9 or 0.8 aperture stops. Stopping down further does not bring any noticea-
ble additional reduction, as all that remains is essentially the natural vignetting. The maximum distortion of the lens is 2.2%,
which in practical terms is negligible for the majority of photographic applications. A total of ten lens elements are used to achie-
ve this exceptional performance. To correct color aberrations, five of these are made of glass types with anomalous color disper-
sion (partial dispersion), while one has an aspherical surface. To maintain performance in the close-up range, one group towards
the rear of the optical system is a "floating element" that moves independently of the rest of the mechanism.
Summary: The LEICA SUMMILUX-M 24mm f/1.4 ASPH offers maximum image performance with a focal length / speed combina-
tion previously unavailable in the M system. This extends the composition options of M photography, particularly for available light
shots, but also thanks to a previously unattainable reduction in the depth of field in combination with large angles of view.
Lens shape
ASPH.
Floating element

LEICA SUMMILUX-M 24 mm f/1.4 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
84° / 74° / 53°
Number of lenses/groups: 10 / 8
Focal length: 24.3 mm
Position of entrance pupil: 19.2 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: 609 x 914 mm
Largest reproduction ratio: 1:25
Setting/Function: With click-stops, half values available, manual diaphragm
Lowest value: 16
Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models
Series filter VII in lens hood
Seperate, clip-on type
Length: 58.5 mm / 75.6 (without / with lens hood)
Largest diamater: approx. 61.0 mm
Weight: approx. 500 g

LEICA SUMMILUX-M 24 mm f/1.4 ASPH. 3
0 5 10 15 20
Y' [mm] = 21.0
0
20
40
60
80
100
[%] Aperture Stop 1.4
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0369121518
0
3
6
9
12
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
0 5 10 15 20
Y' [mm] = 21.0
0
20
40
60
80
100
Aperture Stop 5.6
[%]
05101520
0
20
40
60
80
100
05101520
0369121518
0
3
6
9
12
05101520
0
20
40
60
80
100
0 5 10 15 20
Y' [mm] = 21.0
0
20
40
60
80
100
[%] Aperture Stop 2.8
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0369121518
0
3
6
9
12
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 SUMMILUX-M 24 mm f/1.4 ASPH. 4
Distortion
Vignetting
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
0 5 10 15 20
Y' [mm] = 21.0
-5
-4
-3
-2
-1
0
1
2
3
4
5[%] Relative Distortion
0369121518
0
3
6
9
12
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
0 5 10 15 20
Y' [mm] = 21.0
0
20
40
60
80
100
[%] Vignetting
1.4
2.8
5.6
05101520
0369121518
0
3
6
9
12
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0
20
40
60
80
100
05101520
0 3 6 9 12 15 18
X'[mm]
0
3
6
9
12
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 SUMMILUX-M 24 mm f/1.4 ASPH. 5
Depth of field table
Magnification
0,7 0,669 - 0,734 0,658 - 0,748 0,643 - 0,770 0,622 - 0,804 0,595 - 0,856 0,560 - 0,950 0,523 - 1,103 0,471 - 1,524 1/25,4
0,8 0,759 - 0,847 0,744 - 0,866 0,725 - 0,895 0,697 - 0,944 0,663 - 1,018 0,619 - 1,157 0,572 - 1,401 0,510 - 2,194 1/29,5
1 0,934 - 1,077 0,912 - 1,109 0,881 - 1,160 0,839 - 1,246 0,789 - 1,385 0,725 - 1,668 0,660 - 2,256 0,576 - 5,706 1/37,8
1,2 1,104 - 1,315 1,072 - 1,365 1,029 - 1,445 0,971 - 1,585 0,903 - 1,823 0,819 - 2,365 0,735 - 3,805 0,630 - ∞ 1/46
1,5 1,351 - 1,689 1,302 - 1,774 1,237 - 1,915 1,152 - 2,177 1,056 - 2,667 0,940 - 4,060 0,829 - 12,16 0,695 - ∞ 1/58,4
2 1,738 - 2,360 1,656 - 2,534 1,551 - 2,840 1,416 - 3,474 1,271 - 4,968 1,103 - 14,38 0,950 - ∞ 0,775 - ∞ 1/78,9
3 2,436 - 3,918 2,275 - 4,434 2,076 - 5,495 1,838 - 8,605 1,595 - 36,20 1,335 - ∞ 1,113 - ∞ 0,876 - ∞ 1/120
5 3,589 - 8,298 3,245 - 11,09 2,849 - 21,80 2,411 - ∞ 2,005 - ∞ 1,605 - ∞ 1,289 - ∞ 0,978 - ∞ 1/202
∞ 12,38 - ∞ 8,999 - ∞ 6,448 - ∞ 4,535 - ∞ 3,259 - ∞ 2,302 - ∞ 1,692 - ∞ 1,184 - ∞ 1/∞
Distance Setting [m]
16
perture Stop
4 5,6 8 111,4 2 2,8
perture Stop 1,4
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]
perture Stop 2
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]

LEICA SUMMILUX-M 24 mm f/1.4 ASPH. 6
perture Stop 5,6
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]
perture Stop 2,8
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]
perture Stop 4
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]

LEICA SUMMILUX-M 24 mm f/1.4 ASPH. 7
Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon [phone] / Telefax [phone]
www.leica-camera.com / [e-mail]
perture Stop 8
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]
perture Stop 16
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]
perture Stop 11
0 1 2 3 4 5 6 7 8 9 10
∞
5
3
2
1,5
1,2
1
0,8
0,7
Distance Setting [m]
Depth of Field [m]