Summarit M 50 / 2 5 - Lens LEICA - Free user manual and instructions
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USER MANUAL Summarit M 50 / 2 5 LEICA
Powerful, lightweight and designed to be easy to operate, the LEICA SUMMARIT-M 50 mm f/2.5's applications are as varied as life itself. It corresponds closely to the field of vision and viewing patterns of the human eye and offers an impressively neutral and natural perspective. On analog cameras, it is a brilliant standard lens while on the digital LEICA M8, its 67 mm equivalent focal length makes it ideal for portraits or picking out precise details.
The 50 mm Summarit-M is tailor-made for everyday photography. Its lens speed is perfectly adapted for all common applications. It is an updated double-Gauss six-element construction based on our tried and tested design. All of this means that this particular Summarit-M makes the Leica M easier to experience than ever before, without cutting any corners in terms of optical performance.
Lens shape
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Pure geometric diagram of two symmetrical lens-like shapes with no text or symbols
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2.5 3 4 5 8 15 1 1.2 1.5 2 3 5 50 16 11 8 4Engineering drawing
| Technical Data | |
| Angle of view (diagonal, horizontal, vertical) | For 35 mm (24 x 36 mm) : 47°, 40°, 27°, for LEICA M8 (18 x 27 mm) : 36°, 30°, 20°,corresponds to a focal length of approx. 67 mm with 35 mm-format |
| Optical design | Number of lenses/groups: 6/4Focus length: 50.1 mmPosition of entrance pupil: 28.0 mm (related to the first lens surface in light direction) |
| Distance setting | Focusing range: 0.8 m to endlessScales: Combined meter/feet graduationSmallest object field / Largest reproduction ratio:For 35 mm, approx. 338 x 508 mm/1:14.1for LEICA M8, approx. 254 x 380 mm/1:14.1 |
| Aperture | Setting/Function: Preset, with click-stops, half values availableLowest value: 16 |
| Bayonet | Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models |
| Filter mount/Lens hood | Non-rotating, internal thread for screw-on filters size E39, external thread with stop for lens hood,protection ring for external thread included in delivery, lens hood available as accessory |
| Dimensions and weight | Length: approx. 33.0 mmLargest diameter: approx. 51.5 mmWeight: approx. 230 g |
MTF graphs
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| Y' [mm] | Percentage [%] | | ------- | -------------- | | 0 | 60 | | 5 | 60 | | 10 | 60 | | 15 | 60 | | 20 | 60 | | 21.0000 | 40 | | 21.0000 | 80 | | 21.0000 | 90 | | 21.0000 | 100 |
line
| Y' [mm] | Value [%] | | ------- | --------- | | 0 | 65 | | 5 | 70 | | 10 | 75 | | 15 | 80 | | 20 | 85 | | 25 | 90 | | 30 | 95 | | 35 | 98 | | 40 | 99 | | 45 | 98 | | 50 | 95 | | 55 | 90 | | 60 | 85 | | 65 | 75 | | 70 | 65 | | 75 | 55 | | 80 | 45 | | 85 | 35 | | 90 | 25 | | 95 | 15 | | 100 | 5 |
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| Y' [mm] | Value [%] | | ------- | --------- | | 0 | 65 | | 5 | 70 | | 10 | 75 | | 15 | 80 | | 20 | 85 | | 21.0000 | 90 |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 across 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.
sagittal structures tangential structures
Disortion
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| Y' [mm] | Relative Distortion [%] | | ------- | ------------------------ | | 0 | 0.0 | | 5 | 0.1 | | 10 | 0.3 | | 15 | 0.6 | | 20 | 0.9 | | 25 | 1.0 | | 30 | 1.0 | | 35 | 1.0 | | 40 | 1.0 | | 45 | 1.0 | | 50 | 1.0 | | 55 | 1.0 | | 60 | 1.0 | | 65 | 1.0 | | 70 | 1.0 | | 75 | 1.0 | | 80 | 1.0 | | 85 | 1.0 | | 90 | 1.0 | | 95 | 1.0 | | 100 | 1.0 |
line
| X'[mm] | Y'[mm] | | ------ | ------ | | 0 | 12 | | 3 | 12 | | 6 | 12 | | 9 | 12 | | 12 | 12 | | 15 | 12 | | 18 | 12 | | 21 | 12 | | 24 | 12 | | 27 | 12 | | 30 | 12 | | 33 | 12 | | 36 | 12 | | 39 | 12 | | 42 | 12 | | 45 | 12 | | 48 | 12 | | 51 | 12 | | 54 | 12 | | 57 | 12 | | 60 | 12 | | 63 | 12 | | 66 | 12 | | 69 | 12 | | 72 | 12 | | 75 | 12 | | 78 | 12 | | 81 | 12 | | 84 | 12 | | 87 | 12 | | 90 | 12 | | 93 | 12 | | 96 | 12 | | 99 | 12 | | 102 | 12 | | 105 | 12 | | 108 | 12 | | 111 | 12 | | 114 | 12 | | 117 | 12 | | 120 | 12 | | 123 | 12 | | 126 | 12 | | 129 | 12 | | 132 | 12 | | 135 | 12 | | 138 | 12 | | 141 | 12 | | 144 | 12 | | 147 | 12 | | 150 | 12 | | 153 | 12 | | 156 | 12 | | 159 | 12 | | 162 | 12 | | 165 | 12 | | 168 | 12 | | 171 | 12 | | 174 | 12 | | 177 | 12 | | 180 | 12 | | 183 | 12 | | 186 | 12 | | 189 | 12 | | 192 | 12 | | 195 | 12 | | 198 | 12 | | 201 | 12 | | 204 | 12 | | 207 | 12 | | 210 | 12 | | 213 | 12 | | 216 | 12 | | 219 | 12 | | 222 | 12 | | 225 | 12 | | 228 | 12 | | 231 | 12 | | 234 | 12 | | 237 | 12 | | 240 | 12 | | 243 | 12 | | 246 | 12 | | 249 | 12 | | 252 | 12 | | 255 | 12 | | 258 | 12 | | 261 | 12 | | 264 | 12 | | 267 | 12 | | 270 | 12 | | 273 | 12 | | 276 | 12 | | 279 | 12 | | 282 | 12 | | 285 | 12 | | 288 | 12 | | 291 | 12 | | 294 | 12 | | 297 | 12 | | 300 | 12 | | | |Vignetting
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| Y' [mm] | 5.6 | 4.0 | 2.5 | | ------- | ---- | ---- | ---- | | 0 | 100 | 100 | 100 | | 5 | 98 | 97 | 96 | | 10 | 95 | 93 | 90 | | 15 | 90 | 88 | 85 | | 20 | 85 | 82 | 78 | | 25 | 80 | 75 | 70 | | 30 | 75 | 68 | 62 | | 35 | 70 | 62 | 55 | | 40 | 65 | 55 | 48 | | 45 | 60 | 50 | 42 | | 50 | 55 | 45 | 38 | | 55 | 50 | 40 | 35 | | 60 | 45 | 35 | 32 | | 65 | 40 | 30 | 30 | | 70 | 35 | 25 | 28 | | 75 | 30 | 20 | 25 | | 80 | 25 | 15 | 22 | | 85 | 20 | 10 | 20 | | 90 | 15 | 5 | 18 | | 95 | 10 | 2 | 15 | | 100 | 5 | 1 | 12 | | 105 | 2 | 0.5 | 10 | | 110 | 1 | 0.2 | 8 | | 115 | 0.5 | 0.1 | 6 | | 120 | 0.2 | 0.05 | 4 | | 125 | 0.1 | 0.02 | 3 | | 130 | 0.05 | 0.01 | 2 | | 135 | 0.02 | 0.005| 1 | | 140 | 0.01 | 0.002| 0.5 | | 145 | 0.005| 0.001| 0.2 | | 150 | 0.002| 0.0005|0.1| | 155 | 0.001| 0.0002|0.05| | 160 | 0.0005|0.0001|0.02| | 165 | 0.0002|0.00005|0.01| | 170 | 0.0001|0.00002|0.005| | 175 | 0.00005|0.00001|0.002| | 180 | 0.00002|0.000005|0.0 | | 185 | 0.00001|0.000002|0.0 | | 190 | 0.000005|0.000001|0.0 | | 195 | 0.000002|0.0000005|0.0| | 200 | 0.0 | - | - |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 continuous 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.
____ Depth of field table
| Aperture Stop | Magnification | ||||||||||
| 5,6 8 11 16 | 2,5 2,8 4 | ||||||||||
| Distance Setting [m] | 0,8 0,781 - 0,820 0,779 | -0,822 0,770 - 0,832 | 0,759 - 0,846 0,743 | -0,867 0,724 - | 0,896 0,694 - 0,947 | 1/14,1 | |||||
| 1 0,970 - 1,032 0,967 | -1,036 0,953 - 1,052 | 0,936 - 1,074 0,911 | -1,110 0,881 - | 1,157 0,837 - 1,247 | 1/18,1 | ||||||
| 1,2 1,157 - 1,247 1,152 | -1,252 1,132 - 1,276 | 1,108 - 1,310 1,072 | -1,363 1,031 - | 1,437 0,970 - 1,580 | 1/22,1 | ||||||
| 1,5 1,433 - 1,574 1,425 | -1,584 1,395 - 1,623 | 1,357 - 1,678 1,304 | -1,768 1,243 - | 1,896 1,154 - 2,156 | 1/28,1 | ||||||
| 2 1,881 - 2,136 1,867 | -2,154 1,815 - 2,228 | 1,751 - 2,334 1,662 | -2,514 1,564 - | 2,783 1,424 - 3,391 | 1/38,1 | ||||||
| 3 2,736 - 3,321 2,707 | -3,365 2,599 - 3,550 | 2,467 - 3,831 2,293 | -4,348 2,108 - | 5,234 1,859 - 7,938 | 1/58,1 | ||||||
| 5 4,303 - 5,969 4,230 | -6,115 3,970 - 6,760 | 3,669 - 7,869 3,294 | -10,44 2,922 - | 17,69 2,460 -∞ 1/98,1 | |||||||
| ∞ 30,48 -∞ 27,15 -∞ 1 | 9,03 -∞ 13,61 -∞ | 9,537 -∞ 6,945 -∞ | 4,784 -∞ 1/∞ | ||||||||
scatter
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 0.8 | 0.8 | | 1.0 | 1.0 | | 1.2 | 1.2 | | 1.5 | 1.5 | | 2.0 | 2.0 | | 3.0 | 3.0 | | 4.5 | 5.0 | | 6.0 | 5.0 |
scatter
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 0.5 | 0.8 | | 1.0 | 1.0 | | 1.5 | 1.2 | | 2.0 | 1.5 | | 3.0 | 2.0 | | 4.5 | 3.0 | | 5.0 | 5.0 | | 6.0 | 5.0 |
scatter
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 2 | 0.8 | | 3 | 1.0 | | 4 | 1.2 | | 5 | 1.5 | | 6 | 2.0 | | 7 | 3.0 | | 9 | 5.0 | | 10 | 5.0 | | 17 | 5.0 | | 20 | 0.8 |
scatter
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 2 | 0.8 | | 3 | 1.0 | | 4 | 1.2 | | 5 | 1.5 | | 6 | 2.0 | | 7 | 3.0 | | 8 | 5.0 | | 9 | 11.0 | | 10 | 19.0 | | 19 | ∞ |
bar
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 3 | 0.8 | | 4 | 1 | | 5 | 1.2 | | 6 | 1.5 | | 7 | 2 | | 8 | 3 | | 9 | 5 | | 10 | 5 | | 11 | 5 | | 12 | 5 | | 13 | 5 | | 14 | 5 | | 15 | 5 | | 16 | 5 | | 17 | 5 | | 18 | 5 | | 19 | 5 | | 20 | 5 |
bar
| Depth of Field [m] | Distance Setting [m] | | ------------------ | -------------------- | | 2 | 0.8 | | 3 | 1 | | 4 | 1.2 | | 5 | 1.5 | | 6 | 2 | | 7 | 3 | | 8 | 5 | | 9 | 5 | | 10 | 5 | | 14 | 5 | | 18 | 5 | | 20 | 5 |
