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It is worth noting that Sigma also make the mm f/456 DG Macro APO This features Special LowDispersion elements to reduce chromatic aberration and costs approximately 50% more This lensThe Sigma APO mm f456 DG Macro Lens for Canon Digital SLR Cameras is a telephoto zoom lens with telemacro functionality Optimized for digital cameras, this highperformance lens has two Special Low Dispersion (SLD) glass elements in the front lens group and one in the rear lens groupSigma mm DG Macro Review Manufacturer Sigma Price as reviewed £ Sigma's mm has an impressive list of features but it also calls forth the warning that if something sounds too good to be true, then maybe that's exactly what it is Its mm focallength range may be more than many users will really need in an Sigma 70 300mm F4 5 6 Apo Macro Dg Lens For Pentax Digital Film Slr Cameras By Aubree Fields Issuu Sigma 70-300mm f4-5.6 dg macro for nikon review