![]() Meticulous deployment of these types of exclusive low-dispersion glass and optimization of power distribution gives SIGMA lenses superlative image rendition undiminished by residual chromatic aberration. In particular, FLD glass offers ultra-low dispersion in combination with high transmittance and the anomalous dispersion characteristics of fluorite. To minimize this secondary spectrum, which can be a serious issue with conventional lenses, SIGMA lenses feature up to three types of exclusive low-dispersion glass offering superior performance: ELD (Extraordinary Low Dispersion), SLD (Special Low Dispersion) and FLD (“F” Low Dispersion). The AF speed, focus limiter and OS function are also customizable for. The adjustment is processed with special software (SIGMA Optimization Pro). ![]() It is designed for use with the New Contemporary, Art and Sports product lines. Yet residual chromatic aberration known as “secondary spectrum” may still remain. SIGMA USB DOCK enables photographers to update the lens firmware and adjust parameters such as focus. Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. SIGMA Optimization Pro is the dedicated software that enables you to connect lenses from new product lines to your computer via SIGMA USB Dock, and to customize the lens with operations such as firmware update and focus adjustment. ![]() The result is chromatic aberration, the color fringing that is particularly noticeable in telephoto lenses. This fact causes different colors of light to focus at slightly different points. Exclusive SIGMA Optimization Pro software makes customization easy. The degree to which light is refracted by glass depends on the light’s wavelength. USB DOCK UD-01 Features Product Lineup Support Catalogs / Resources By connecting a SIGMA Art, Contemporary, or Sports lens to a computer with the SIGMA USB DOCK, photographers can update the lens firmware and adjust focus position and other parameters.
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