LEICA APO-SUMMICRON-MSUPER ELMAR-M 21mm 50 mm f/3.4 f/2 ASPH. ASPH. 1 More than 30 years after the launch of Summicron-M 1:2/50 mm, which is still available, the Leica APO Summicron-M 1:2/50 mm ASPH. represents a totally new development. With its compact body - only marginally longer and slightly heavier than the Summicron-M 1:2/50 mm, and with an almost identical diameter, it provides visibly higher image quality. On the Leica APO Summicron-M 1:2/50 mm ASPH. the exceptional correction enables all aberrations to be reduced to a minimum level that is negli- gible in digital photography. Its key features include excellent contrast rendition, all the way to the corners of the image, even with a fully open aperture. The use of a „floating element“ ensures that this is retained, even for close-up shots. Vignetting is limited to a maximum - i.e. in the corners of the image - of just 2 stops at full aperture in 35 mm format, or around 1 on the Leica M8 mo- dels. Stopping down to 2.8 visibly reduces this light deterioration towards the edge of the image, with practically only the natural vignetting remaining. Distortion is very low at a maximum of just 0.4 % (pin cushoin), which is practically imperceptible. A total of eight lens elements are used to achieve this exceptional performance. To realize the apochromatic correction (resulting in a com- mon focusing plane for three light wavelengths), three are made of glass types with high anomalous partial color dispersion, while two of the others have a high refractive index. The aspherical surface of the first lens in the rear group helps to reduce spherical aberration and flatten the image field. While the optical construction in front of the aperture is a Gaussian type, the arrangement of the lens elements behind it is similar to that in the Summilux-M 1:1.4/35 mm ASPH. This group comprises a „floating element“, which is moved independently of the rest of the construction during focusing. Summary: The Leica APO Summicron-M 1:2/50 mm ASPH. delivers exceptional picture quality and sets new standards in 35 mm digital photography. Optical design AsphericalAsphäre surface FloatingFloatingElement Element LEICA APO-SUMMICRON-MSUPER ELMAR-M 21mm 50 mm f/3.4 f/2 ASPH. ASPH. 2 Engineering drawing Technical Data Angle of view (diagonal, horizontal, vertical) 47° / 40° / 27° (With Leica M8 models: 36° / 30° / 20°) Optical design Number of lenses/groups: 8 / 5 Position of entrance pupil (from bayonet flange): 24.4 mm Focus range: 0.7 m to ∞ Distance setting Scales: Combined meter / graduation Smallest object field: approx. 271 mm x 407 mm (With Leica M8 models: 203 mm x 305 mm) Largest reproduction ratio: approx. 1:11.3 Aperture Setting / Function: prefix with click-stops, half steps Lowest value: 16 Bayonet Leica M quick-change bayonet Lens hood Built-in, extendable by rotating Filter mount Female thread for screw-on E39 filters, non-rotating Dimensions and weight Length: approx. 47 mm Largest diameter: approx. 53 mm Weight: approx. 300 g Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm Blende2,0 Vignettierung Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm[%] [%] LEICA APO-SUMMICRON-MSUPER ELMAR-M 21mm 50 mm 100f/3.4 f/2 ASPH. ASPH. 100 Blende2,0 Vignettierung 3 [%] [%] 80 80 5,6 100 100 2,8 2,0 80 80 60 5,6 60 2,8 2,0 60 60 40 40 20 20 MTF-graphs40 40 20 20 0 0 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm Y'[mm] Y'[mm] 0 0 0 3 6 9 12 15 18 21 0 3 6 Vignettierung9 12 15 18 21 Blende2,0 f/2.0 Aperture Blende2,8 Stop f/2.8 5.6 RelativeVerzeichnung [%] [%] [%] [%] 100 Y'[mm] 100 100 Y'[mm] 5 4 Blende2,8 RelativeVerzeichnung 80[%] 80[%] 5,6 100 5 80 2,8 3 4 2,0 2 60 60 80 3 60 1 2 0 40 40 60 1 40 -1 0 -2 20 20 40 -1 20 -3 -2 -4 0 0 20 -3 0 -5 0 3 6 9 12 15 18 21 0 3 6 0 9 3 12 6 15 9 18 1221 15 18 21 0 3 6 9 12 15 18 21 -4 Y'[mm] Y'[mm] Y'[mm] Y'[mm] 0 -5 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 Blende2,8 RelativeVerzeichnungBlende5,6 EffektiveVerzeichnung [%] [%] [%] 100 Y'[mm] 5 100 Y'[mm] 4 Y'[mm] Blende5,6 f/5.6 EffektiveVerzeichnung 80[%] 3 100 80 2 The MTF is indicated at full aperture, at f/2,8 and f/5,612 Y'[mm] 60 1 at long taking distances (infinity). Shown is the contrast 80 in percentage60 for 5, 10, 20 and 40 lp/mm accross the 0 9 12 height of the 35 mm film format, for tangential (dotted 40 -1 40 60 line) and sagittal (solid line) structures, in white light.6 -29 The 5 and 10 lp/mm will give an indication regarding 20 -3 40 the contrast20 ratio for large object structures. The 203 -46 and 40 lp/mm records the resolution of finer and finest 0 -5 object structures. 20 0 0 0 3 6 9 12 15 18 21 3 0 3 6 0 9 3 12 6 15 9 18 1221 15 18 21 0 3 6 9 12 15 18 Y'[mm] tangential structuresY'[mm] Y'[mm] X'[mm] 0 0 sagittal structures 0 3 6 Blende5,69 12 15 18 21 0 3 EffektiveVerzeichnung6 9 12 15 18 [%] 100 Y'[mm] X'[mm] Y'[mm] 80 12 60 9 40 6 20 3 0 0 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 Y'[mm] X'[mm] Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm Blende2,0 Vignettierung [%] [%] 100 100 80 80 5,6 2,8 2,0 60 60 40 40 20 20 0 0 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm Y'[mm] Y'[mm] Blende2,8 RelativeVerzeichnung Blende2,0 Vignettierung[%] [%] [%] [%] 100 5 100 100 LEICA APO-SUMMICRON-MSUPER ELMAR-M 21mm 50 4mm f/3.4 f/2 ASPH. ASPH. 80 3 4 80 80 5,6 2,8 2 2,0 60 60 60 1 0 40 40 40 -1 -2 20 20 20 -3 -4 0 Distortion0 0 -5 0 3 6 9 12 15 18 21 0 3 6 09 312 615 918 1221 15 18 21 0 3 6 9 12 15 18 21 Y'[mm] Y'[mm] Y'[mm] Y'[mm] Relative Distortion Effective Distortion Blende2,8 RelativeVerzeichnungBlende5,6 EffektiveVerzeichnung [%] [%] [%] 100 5 100 4 Y'[mm] 80 3 80 12 2 60 1 60 9 0 40 40 -1 6 -2 20 -3 20 3 -4 0 -5 0 0 0 3 6 9 12 15 18 21 0 3 6 09 312 615 918 1221 15 18 21 0 3 6 9 12 15 18 Y'[mm] Y'[mm] Y'[mm] X'[mm] Blende5,6 EffektiveVerzeichnung [%] 100 Y'[mm] 80 12 60 Vignetting 9 40 6 Apo-Summicron-M1:2,0/50mmASPH.Brennweite50mm 20 3 Blende2,0 Vignettierung [%] [%] 1000 1000 Distortion is the deviation of the real image height (in 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 the picture) from the ideal image height. The relative Y'[mm] X'[mm] 80 80 f/5.65,6 distortion is the percentage deviation. The ideal image f/2.82,8 height results from the object height and the magnifica- f/2.0 2,0 tion. The image height of 21.6 mm is the radial distance 60 60 between the edge and the middle of the image field for the 24 mm x 36 mm format. The graph of the effective 40 40 distortion illustrates the appearance of straight horizon- tal and vertical lines in the picture. 20 20 Vignetting is a continous decrease of the illumination to- 0 0 wards the edges of the image field. The graph shows the 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 percentage lost of illumination over the image height. Y'[mm] Y'[mm] 100% means no vignetting. Blende2,8 RelativeVerzeichnung [%] [%] 100 5 4 80 3 2 60 1 0 40 -1 -2 20 -3 -4 0 -5 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 Y'[mm] Y'[mm] Blende5,6 EffektiveVerzeichnung [%] 100 Y'[mm] 80 12 60 9 40 6 20 3 0 0 0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 Y'[mm] X'[mm] LEICA APO-SUMMICRON-MSUPER ELMAR-M 21mm 50 mmf/3.4 f/2 ASPH. ASPH. 5 Depth of field table ApertureBlende Stop MagnificationVergrößerung 2,0 2,8 4,0 5,6 8,0 11,0 16,0 0,7 0,690 - 0,710 0,686 - 0,714 0,681 - 0,721 0,673 - 0,729 0,662 - 0,743 0,649 - 0,760 0,629 - 0,792 1/11,3 0,8 0,787 - 0,814 0,782 - 0,819 0,774 - 0,828 0,764 - 0,840 0,750 - 0,858 0,733 - 0,882 0,706 - 0,926 1/13,2 Blende Vergrößerung 1 0,979 - 1,023 0,971 - 1,032 0,958 - 1,046 0,943 - 1,065 0,920 - 1,096 0,894 - 1,137 0,853 - 1,214 1/17,1 2,0 2,8 4,0 5,6 8,0 11,0 16,0 1,2 1,169 - 1,233 1,157 - 1,247 1,139 - 1,268 1,117 - 1,297 1,085 - 1,345 1,047 - 1,409 0,991 - 1,531 1/21 0,7 0,690 - 0,710 0,686 - 0,714 0,681 - 0,721 0,673 - 0,729 0,662 - 0,743 0,649 - 0,760 0,629 - 0,792 1/11,3 1,5 1,450 - 1,554 1,432 - 1,575 1,404 - 1,610 1,370 - 1,659 1,321 - 1,739 1,264 - 1,850 1,181 - 2,071 1/26,8 0,8 0,787 - 0,814 0,782 - 0,819 0,774 - 0,828 0,764 - 0,840 0,750 - 0,858 0,733 - 0,882 0,706 - 0,926 1/13,2 2 1,910 - 2,099 1,878 - 2,139 1,830 - 2,205 1,771 - 2,300 1,688 - 2,459 1,595 - 2,693 1,462 - 3,203 1/36,5 1 0,979 - 1,023 0,971 - 1,032 0,958 - 1,046 0,943 - 1,065 0,920 - 1,096 0,894 - 1,137 0,853 - 1,214 1/17,1 3 2,799 - 3,233 2,729 - 3,332 2,627 - 3,499 2,503 - 3,749 2,338 - 4,201 2,161 - 4,950 1,919 - 7,055 1/55,8 1,2 1,169 - 1,233 1,157 - 1,247 1,139 - 1,268 1,117Blende - 1,297 1,085 - 1,345 1,047 - 1,409 0,991 - 1,531Vergrößerung 1/21 Eingestellte Entfernung [m] Entfernung Eingestellte Distance Setting [m] Setting Distance 5 4,458 - 5,694 4,280 - 6,016 4,032 - 6,591 3,743 - 7,556 3,381 - 9,690 3,017 - 15,01 2,560 - 185,1 1/94,5 1,5 1,4502,0 - 1,554 1,4322,8 - 1,575 1,4044,0 - 1,610 1,3705,6 - 1,659 1,3218,0 - 1,739 1,26411,0 - 1,850 1,18116,0 - 2,071 1/26,8 ∞ 40,20 - ∞ 29,05 - ∞ 20,36 - ∞ 14,55 - ∞ 10,20 - ∞ 7,435 - ∞ 5,128 - ∞ 1/∞ 0,72 1,9100,690 - 2,0990,710 1,8780,686 - 2,1390,714 1,8300,681 - 2,2050,721 1,7710,673 - 2,3000,729 1,6880,662 - 2,4590,743 1,5950,649 - 2,6930,760 1,4620,629 - 3,2030,792 1/36,51/11,3 0,83 2,7990,787 - 3,2330,814 2,7290,782 - 3,3320,819 2,6270,774 - 3,4990,828 2,5030,764 - 3,7490,840 2,3380,750 - 4,2010,858 2,1610,733 - 4,9500,882 1,9190,706 - 7,0550,926 1/55,81/13,2 1 0,979 - 1,023 0,971 - 1,032 0,958 - 1,046 0,943 - 1,065 0,920 - 1,096 0,894 - 1,137 0,853 - 1,214 1/17,1 Eingestellte Entfernung [m] Entfernung Eingestellte 5 4,458 - 5,694 4,280 - 6,016 4,032 -Blende 6,591 2,0 3,743 - 7,556 3,381 - 9,690 3,017 - 15,01 2,560 - 185,1 1/94,5 1,2∞ 40,201,169 - 1,233 ∞ 29,051,157 -