Summary of Contents for Leica SUPER-ELMAR-M 18 mm f/3.8 ASPH.
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With the lens set to maximum aperture and mounted on a traditional Leica M or digital LEICA M8 model, vignetting – an effect which is inherently more prevalent with super wide angle lenses –...
Engineering drawing Technical Data Angle of view (diagonal, horizontal, vertical) For 35 mm: 100°, 90°, 67° / For LEICA M8 models (18 x 27 mm): 84°, 74°, 53° Optical design Number of lenses/groups: 8 / 7 Focal length: 18.3 mm Position of entrance pupil: 19.8 mm (related to the first lens surface in light direction)
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. MTF graphs Aperture Stop 3.8 Aperture Stop 8.0 Y' [mm] = 21.0 Y' [mm] = 21.0 Aperture Stop 5.6 The MTF is indicated both at full aperture and at f/5.6 at long taking distances (infinity). Shown...
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LEICA SUPER-ELMAR-M 18 mm f/3.8 ASPH. Distortion Effective Distortion Relative Distortion Y'[mm] X'[mm] Y' [mm] = 21.0 Vignetting Vignetting Distortion is the deviation of the real image height (in the picture) from the ideal image height. The relative distortion is the percentage deviation.