4/1/2024 0 Comments 50mm summicron asphTo realize the apochromatic correction (resulting in a common 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. A total of eight lens elements are used to achieve this exceptional performance. Stopping down to 2.8 visibly reduces this light deterioration towards the edge of the image, with practically only the natural vignetting remaining.ĭistortion is very low at a maximum of just 0.4 % (pin cushion), which is practically imperceptible. in the corners of the image - of just 2 stops at full aperture in 35 mm format, or around 1 on the Leica M8 models. Vignetting is limited to a maximum - i.e. The use of a "floating element" ensures that this is retained, even for close-up shots. Its key features include excellent contrast rendition, all the way to the corners of the image, even with a fully open aperture. the exceptional correction enables all aberrations to be reduced to a minimum level that is negligible in digital photography. On the Leica APO Summicron-M 1:2/50 mm ASPH.
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