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The Sigma 17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens is packed with wonderful features and provides great perfomance and tack-sharp results. It uses Special Low Dispersion (SLD) lens and high refractive index SLD for excellent correction for aberration and distortion. Its floating focusing system gives high optical performance from infinity to 1:1 macro. Truly a beast for macro photography.
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