LEICA SUMMICRON-M 35 mm f/2 ASPH. Technical Data. Illustrations 1:1 Lens Leica Summicron-M 35 mm f/2 ASPH. Order number Black: 11 673, silver: 11 674 Angle view For 35 mm (24 x 36 mm): approx. 63°/54°/38°; (diagonal, horizontal, vertical) for M8 (18 x 27 mm): approx. 50°/42°/29° Optical design Number of elements/groups: 7/5 Entrance pupil for bayonet: 18,4 mm Focusing range: 0,7 m to infinity Distance setting Scala: combined meter-/feet-increments Smallest object field: for 35 mm: 420 x 630 mm, for M8: 315 x 472 mm Highest reproduction ratio: 1:17,4 Diaphragm Setting/type: preset, with click-stops, half values available Smallest aperture: f/16 Number of aperture blades: 11 Bayonet Leica M quick-change bayonet Filter thread E39 Lens hood Available, screwable (supplied) Dimensions and weight Lenght: approx. 35,7/54,4 mm (without/with lens hood) Largest diameter without lens hood: approx. 53 mm Weight: approx. 252 g/287 g (without/with lens hood and covers) Page 1 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. ENGINEERING DRAWING LENS SHAPE Aspherical lens Illustrations 1:1 Excellent sharpness, high contrast and a very good resolving power over the entire focusing range are evident at full aperture. With its aperture stopped down modestly to f/4, this versatile lens delivers a maximum of resolving power and contrast. It is all the more impressive because of its virtually perfect absence of distortion. That makes it a world-class lens among fast wide-angle lenses. In spite of its high speed and its superb imaging performance, it is surprisingly small. Every Leica M camera fitted with this lens becomes a highly compact and elegant unit. Page 2 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. 3 LEICA SUMMICRON-M 35 mm f/2 ASPH. MTF-GRAPHS MTF graphs Aperture Stop 2.0 Aperture Stop 5.6 [%] [%] 100 100 80 80 60 60 40 40 20 20 0 0 0 5 10 15 20 0 5 10 15 20 Y' [mm] Y' [mm] Aperture Stop 2.8 [%] 100 The MTF is indicated both at full aperture and at f/5.6 at long taking distances (infinity). Shown 80 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 60 (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 40 20 and 40 lp/mm records the resolution of finer and finest object structures. 20 Sagittal structures sagittal structures 0 _ _ _ _ _ _ _ _ tangentialTangential structures structures 0 5 10 15 20 Y' [mm] 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. Page 3 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. 4 LEICA SUMMICRON-M 35 mm f/2 ASPH. 4 LEICA SUMMICRON-M 35 mm f/2 ASPH. Distortion Distortion Distortion Relative Distortion Effective Distortion [%] 5 Relative Distortion Effective Distortion 4[%] Y' [mm] 5 3 4 Y' [mm] 2 12 3 1 2 12 0 9 1 -1 0 69 -2 -1 -3 6 -2 3 -4 -3 -5 03 -4 0 5 10 15 20 0 3 6 9 12 15 18 -5 Y' [mm] 0 X' [mm] 0 5 10 15 20 0 3 6 9 12 15 18 Y' [mm] X' [mm] VIGNETTING Vignetting Vignetting Distortion is the deviation of the real image height [%] 100 (in the picture) from the ideal image height. The relativeDistortion distortion is the deviation is the percentage of the real deviation. image height [%] The(in the ideal picture) image fromheight the results ideal imagefrom the height. object The 100 5.6 80 heightrelative and distortion the magnification. is the percentage The image deviation. height of 2.8 21.6mmThe ideal is image the radial height distance results betweenfrom the theobject edge and 80 2.05.6 theheight middle and ofthe the magnification. image field for The the image format height 24mm of x 60 2.8 36mm.21.6mm The is the graph radial of thedistance effective between distortion the edge illustra- and 2.0 testhe themiddle appearance of the image of straight field for horizontal the format and 24mm verti- x 60 40 cal36mm. lines The in the graph picture. of the effective distortion illustra- tes the appearance of straight horizontal and verti- Vignetting is a continous decrease of the illumina- 40 cal lines in the picture. 20 tion to the edges of the image field. The graph showsVignetting the percentageis a continousSagittal lost decrease ofstructures illumination of the overillumina- the 20 imagetion to height. the edges 100% of meansthe image no vignetting.field. The graph 0 shows the percentageTangential lost of structuresillumination over the 0 5 10 15 20 image height. 100%sagittal means structures no vignetting. _ _ _ _ _ _ _ _ 0 Y' [mm] tangential structures 0 5 10 15 20 sagittal structures _ _ _ _ _ _ _ _ Y' [mm] tangential structures 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 21.6 mm is the radial distance between the edge and the middle of the image field for the format 24 mm x 36 mm. The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture. VIGNETTING 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. Page 4 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. DEPTH OF FIELD table Page 5 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. Page 6 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com LEICA SUMMICRON-M 35 mm f/2 ASPH. Page 7 of 7 I As at January 2016 I Specifications are subject to change without notice Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com.