Leica Summilux-M 21mm 1.4 ASPH User Manual

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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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The LEICA SUMMILUX-M 21mm 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 ele­ment". 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 3.2 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 1.7 or 0.8 aperture stops. Stopping down further does not bring any noticea­ble additional reduction, as all that remains is essentially the natural vignetting. The maximum distortion of the lens is 2.3%, which in practical terms is negligible for the majority of photographic applications. A total of ten lens elements are used to achie­ve this exceptional performance. To correct color aberrations, five of these are made of glass types with anomalous color disper­sion (partial dispersion), while a further two have aspherical surfaces. 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 21mm f/1.4 ASPH offers maximum image performance with a focal length / speed combina­tion 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
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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Engineering drawing
Technical Data
Angle of view (diagonal, horizontal, vertical)
Optical design
Distance setting
Aperture
Bayonet
Filter mount
Lens hood
Dimension and weight
92° / 81° / 59°
Number of lenses/groups: 10 / 8
Focal length: 21.6 mm
Position of entrance pupil: 24.4 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: 685 x 1027 mm
Largest reproduction ratio: 1:29
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 VIII in lens hood
Seperate, screw-on type
Length: 66 / 77 mm (without / with lens hood)
Largest diamater: approx. 69.5 mm
Weight: approx. 580 g
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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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
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[%]
Aperture Stop 1.4
[%]
Aperture Stop 2.8
Y' [mm] = 21.0
[%]
Aperture Stop 5.6
Y' [mm] = 21.0
Y' [mm] = 21.0
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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Distortion
Vignetting
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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.
[%]
Relative Distortion
Y' [mm] = 21.0
Vignetting
[%]
5.6
2.8
1.4
Effective Distortion
Y'[mm]
X'[mm]
Y' [mm] = 21.0
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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Depth of field table
Aperture Stop
4 5,6 8 111,4 2 2,8
0,7 0,661 - 0,744 0,648 - 0,762 0,630 - 0,790 0,605 - 0,837 0,574 - 0,910 0,534 - 1,050 0,493 - 1,308 0,438 - 2,275
0,8 0,749 - 0,860 0,731 - 0,884 0,708 - 0,924 0,675 - 0,991 0,636 - 1,098 0,586 - 1,316 0,535 - 1,765 0,469 - 4,314
1 0,918 - 1,099 0,892 - 1,142 0,855 - 1,211 0,806 - 1,333 0,749 - 1,545 0,679 - 2,039 0,609 - 3,457 0,523 - ∞
1,2 1,081 - 1,350 1,044 - 1,416 0,993 - 1,527 0,926 - 1,734 0,850 - 2,120 0,759 - 3,219 0,671 - 9,613 0,565 - ∞
1,5 1,315 - 1,749 1,259 - 1,864 1,184 - 2,068 1,087 - 2,477 0,982 - 3,381 0,859 - 7,657 0,746 - ∞ 0,615 - ∞
2 1,678 - 2,483 1,585 - 2,729 1,465 - 3,201 1,317 - 4,339 1,162 - 8,347 0,991 - ∞ 0,840 - ∞ 0,675 - ∞
3 2,318 - 4,277 2,139 - 5,088 1,922 - 7,085 1,670 - 17,48 1,424 - ∞ 1,170 - ∞ 0,961 - ∞ 0,747 - ∞
Distance Setting [m]
5 3,334 - 10,14 2,970 - 16,51 2,560 - 243,7 2,125 - ∞ 1,736 - ∞ 1,368 - ∞ 1,087 - ∞ 0,817 - ∞
9,734 - ∞ 7,113 - ∞ 5,102 - ∞ 3,593 - ∞ 2,587 - ∞ 1,832 - ∞ 1,351 - ∞ 0,951 - ∞
Aperture Stop 1,4
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
Magnification
16
1/28,7
1/33,3
1/42,6
1/51,9
1/65,8
1/88,9
1/135
1/228
1/∞
Aperture Stop 2
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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Aperture Stop 2,8
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
Aperture Stop 4
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
Aperture Stop 5,6
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
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LEICA SUMMILUX-M 21 mm f/1.4 ASPH.
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Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon +49 (0) 6442- 208-0 / Telefax + 49 (0) 6442-208-333
www.leica-camera.com / info@leica-camera.com
Aperture Stop 8
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
Aperture Stop 11
0,7
0,8
1
1,2
1,5
2
3
Distance Setting [m]
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
Distance Setting [m]
5
0 1 2 3 4 5 6 7 8 9 10
Depth of Field [m]
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