10_ELMAR_M_engl Elmar M 50 Mm Technical Data En
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LEICA ELMAR-M 50 mm f/2.8 This extremely compact lens collapses into the camera body and carries on the tradition of the legendary Elmar lenses on earlier Leica cameras. This design was updated optically and mechanically to a modern standard without compromises. The use of highrefraction optical glass and an intelligent new optical computation led to outstanding overall performance. A classic medium-speed lens with minimal dimensions and a low weight make this a highly versatile lens for many applications. Lens shape 1 LEICA ELMAR-M 50 mm f/2.8 2 Engineering drawing Technical Data Angle of view (diagonal, horizontal, vertical) Optical design 47°, 40°, 27° Number of elements / groups: 4 / 3 Focal length: 51.7 mm Entrance pupil: 17.1 mm (related to the first lens surface in light direction) Focusing range: 0.7 m to Infinity Distance setting Scale: combined meter/feet-increments Smallest object field: 274 mm x 411 mm Highest reproduction ratio: 1:11.4 Diaphragm Setting / Type: with clickstops (including half values from f/2.8 - f/8), manual diaphragm Smallest aperture: f/16 Bayonet Filter (type) Lens hood Dimensions and weight Leica M quick-change bayonet internal thread for screw-in type filters E 39 built-in, telescopic Length: extended (working position): 37.6 mm, collapsed (storage position): 21.6 mm Largest diameter: 52 mm Weight: approx. 170 g / 245 g (black anodized- / silver chrome finish) LEICA ELMAR-M 50 mm f/2.8 3 MTF graphs Aperture Stop 2.8 [%] 100 80 80 60 60 40 40 20 20 0 0 5 10 Aperture Stop 8.0 [%] 100 15 20 Y' [mm] 0 0 5 10 15 Aperture Stop 5.6 [%] 100 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. 80 60 40 20 0 0 20 Y' [mm] 5 10 15 20 Y' [mm] sagittal structures _ _ _ _ _ _ _ _ tangential structures LEICA ELMAR-M 50 mm f/2.8 4 Distortion [%] 5 4 3 2 1 0 -1 -2 -3 -4 -5 Effective Distortion Relative Distortion Y' [mm] 12 9 6 3 0 5 10 15 0 20 0 3 6 9 12 15 18 X' [mm] Y' [mm] Vignetting [%] 100 8.0 5.6 2.8 80 60 40 Vignetting is a continous decrease of the illumination to the edges of the image field. The graph shows the percentage lost of illumination over the image height. 100% means no vignetting. 20 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. 0 5 10 15 20 Y' [mm] sagittal structures _ _ _ _ _ _ _ _ tangential structures LEICA ELMAR-M 50 mm f/2.8 5 Depth of field table ! " #" ! ! " #" !$ ! " #" !$ ! % &' ! % &' LEICA ELMAR-M 50 mm f/2.8 ! " #" !$ ! " #" !$ ! " #" !$ 6 ! % &' ! % &' ! % &' LEICA ELMAR-M 50 mm f/2.8 ! " #" !$ 7 ! % &' 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
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