 BetterPhoto Member |
Aspherical Lenses What is the difference between an aspherical lens and a non-aspherical lens. I've recently been introduced to the aspherical version but haven't had the chance to try them. Please help me out by telling me what the difference is and which is better.
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BetterPhoto Member |
From the Sigma site... Many Sigma lenses make effective use of Aspherical lens elements. This new technology allows one Aspherical lens element to perform the functions of two or more conventional spherical elements, thus allowing the lens to be made more compact and lightweight, while retaining high levels of performance. In the 28mm f/1.8 Aspherical II, for example, these Aspherical elements eliminate the sagittal coma flare that accompanies large lens diameters. They effectively suppress the flare. In zoom lenses, where the wide angle range is extended - such as the 18-35 f/3.5-4.5 Aspherical - distortion control can be enhanced by the use of Aspherical elements. -Valery
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