Use of aspherical elements has its downsides: it leads to non-uniform rendering of out-of-focus highlights. Aspherical element can substitute one or several regular spherical elements to achieve similar or better optical results, which allows to develop more compact and lightweight lenses. The effect of the aspherical element is determined by its position within the optical formula: the more the aspherical element moves away from the aperture stop, the more it influences distortion close to the aperture stop it can be particularly used to correct spherical aberration. Ĭosina Voigtlander Heliar 50mm F/2 VM “Voigtlander 250th Anniversary” Ĭosina Voigtlander Color-Skopar 50mm F/2.5 Ĭosina Voigtlander Heliar 50mm F/2 “Cosina 50th Anniversary, Bessa 10th Anniversary” Ĭosina Voigtlander Nokton 50mm F/1.5 Aspherical Īspherical elements (ASPH, XA, XGM) are used in wide-angle lenses for correction of distortion and in large-aperture lenses for correction of spherical aberration, astigmatism and coma, thus ensuring excellent sharpness and contrast even at fully open aperture. **) Some basic information is missing in the specification as it was not provided by the manufacturer.Ĭosina Voigtlander Apo-Lanthar 50mm F/2 Aspherical VM Ĭosina Voigtlander Nokton 50mm F/1 Aspherical VM Ĭosina Voigtlander Nokton 50mm F/1.2 Aspherical VM Ĭosina Voigtlander Nokton 50mm F/1.5 Aspherical II VM Ĭosina Voigtlander Nokton 50mm F/1.5 Aspherical VM
*) Source of data: Scarce manufacturer's technical data + own research. Leitz / Leitz Canada Summicron-M 50mm F/2 “Leica 1913-1983” Leica Summicron-M 50mm F/2 “Year of the Rooster” Leica Summicron-M 50mm F/2 “LHSA 25th Anniversary” Leica Summicron-M 50mm F/2 “RPS Royal Centenary” Leica Summicron-M 50mm F/2 “Leica HISTORICA 20th Anniversary” Leica Summicron-M 50mm F/2 Gold “King of Thailand”
Leica Summicron-M 50mm F/2 Gold “Sultan of Brunei” Leica Summicron-M 50mm F/2 “150 Jahre Optik” Leica Summicron-M 50mm F/2 “50 Jahre Summicron” Leica APO-Summicron-M 50mm F/2 ASPHERICAL for RED
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