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| Förkortningen betyder |
| APO = Apochromatic |
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| Förklaring från Sigma |
In order to attain the highest quality images, the APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration.
SIGMA´s APO zoom lenses minimizecolor aberration. As the refractiveindex of glass depends on thewavelength of light,color aberrationoccurs when different colors formimages at different points. Thisproblem often occurs with telephotolenses,but the Special Low-Dispersion(SLD) glass and Extraordinary LowDispersion (ELD) used in SIGMA´sAPO lenses helps to compensate forcolor aberration, thereby allowingthem to produce of sharp images. |
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