(4.4 by 3.5 inches) and weight (2 pounds). Its notably heavier than the Tamron (1.21 lb / 550 g), and while its similar in length, the. 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. Weight : Manufacturer Specification Weight: 36 oz (1020g) Actual Weight: 36 oz (1020g) Lens Hood Weight: 1.2 oz (35g) In-Use Weight: 37. The Sigma 24-70mm F2.8 DG OS HSM Art is a budget take on the 24-70mm design, but falls short of the marks we look for in a pro lens. This is still a meaty piece of glass, however. 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). Sigma 24-70mm F/2.8 DG OS HSM Art for Nikon F Sigma 24-70mm Sigma 24-70mm F/2.8 Sigma 24-70mm Art ng kính sigma Sigma 24-70 F2.8 art sigma art sigma for nikon sigma f2.8 lens sigma ng kính sigma f 2.8. Top Sample Images Intro Format Compatibility Specifications Performance Compared. Sigma 24-70mm F/2.8 for Nikon là mt ng kính linh hot chp hng ngày. Yet residual chromatic aberration known as “secondary spectrum” may still remain. Nikon 18-55 AF-P Comparison 16 February 2017. ![]() Most chromatic aberration can be removed by combining a high-refractivity convex lens element with a low-refractivity concave element. ![]() 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. The degree to which light is refracted by glass depends on the light’s wavelength. SIGMA 24-70mm f/2.8 DG OS HSM Art Lens for Nikon F F-Mount Lens/FX Format Aperture Range: f/2.8 to f/22 Three SLD and Four Aspherical Elements Super Multi.
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